diff --git a/composer.lock b/composer.lock
index 48b3ba21a6..91c5de1b70 100644
--- a/composer.lock
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-            "description": "Symfony polyfill backporting some PHP 5.4+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
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-                "portable",
-                "shim"
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-                "url": "https://github.com/symfony/polyfill-php55.git",
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-            "extra": {
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-            "autoload": {
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-                },
-                "files": [
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-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill backporting some PHP 5.5+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "time": "2016-11-14 01:06:16"
-        },
-        {
             "name": "symfony/process",
-            "version": "v2.8.15",
+            "version": "v3.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "1a1bd056395540d0bc549d39818316513565d278"
+                "reference": "350e810019fc52dd06ae844b6a6d382f8a0e8893"
             },
             "dist": {
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-                "url": "https://api.github.com/repos/symfony/process/zipball/1a1bd056395540d0bc549d39818316513565d278",
-                "reference": "1a1bd056395540d0bc549d39818316513565d278",
+                "url": "https://api.github.com/repos/symfony/process/zipball/350e810019fc52dd06ae844b6a6d382f8a0e8893",
+                "reference": "350e810019fc52dd06ae844b6a6d382f8a0e8893",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9"
+                "php": ">=5.5.9"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.8-dev"
+                    "dev-master": "3.2-dev"
                 }
             },
             "autoload": {
@@ -2059,7 +1853,7 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2016-11-24 00:43:03"
+            "time": "2017-01-02 20:32:22"
         },
         {
             "name": "symfony/psr-http-message-bridge",
@@ -2117,32 +1911,32 @@
         },
         {
             "name": "symfony/routing",
-            "version": "v2.8.15",
+            "version": "v3.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/routing.git",
-                "reference": "ef15c9f105f43a0714fa96b9e718fa4f23bc27a6"
+                "reference": "fda2c67d47ec801726ca888c95d701d31b27b444"
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-                "reference": "ef15c9f105f43a0714fa96b9e718fa4f23bc27a6",
+                "url": "https://api.github.com/repos/symfony/routing/zipball/fda2c67d47ec801726ca888c95d701d31b27b444",
+                "reference": "fda2c67d47ec801726ca888c95d701d31b27b444",
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             },
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-                "php": ">=5.3.9"
+                "php": ">=5.5.9"
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             "conflict": {
-                "symfony/config": "<2.7"
+                "symfony/config": "<2.8"
             },
             "require-dev": {
                 "doctrine/annotations": "~1.0",
                 "doctrine/common": "~2.2",
                 "psr/log": "~1.0",
-                "symfony/config": "~2.7|~3.0.0",
-                "symfony/expression-language": "~2.4|~3.0.0",
-                "symfony/http-foundation": "~2.3|~3.0.0",
-                "symfony/yaml": "~2.0,>=2.0.5|~3.0.0"
+                "symfony/config": "~2.8|~3.0",
+                "symfony/expression-language": "~2.8|~3.0",
+                "symfony/http-foundation": "~2.8|~3.0",
+                "symfony/yaml": "~2.8|~3.0"
             },
             "suggest": {
                 "doctrine/annotations": "For using the annotation loader",
@@ -2155,7 +1949,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.8-dev"
+                    "dev-master": "3.2-dev"
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             },
             "autoload": {
@@ -2188,44 +1982,54 @@
                 "uri",
                 "url"
             ],
-            "time": "2016-11-25 12:26:42"
+            "time": "2017-01-02 20:32:22"
         },
         {
             "name": "symfony/serializer",
-            "version": "v2.8.15",
+            "version": "v3.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/serializer.git",
-                "reference": "df9a4f82143668c2f775cc85e1972044c9e93d4d"
+                "reference": "1538e02db55d8ba5b0c29f5062f471fe5b283704"
             },
             "dist": {
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-                "url": "https://api.github.com/repos/symfony/serializer/zipball/df9a4f82143668c2f775cc85e1972044c9e93d4d",
-                "reference": "df9a4f82143668c2f775cc85e1972044c9e93d4d",
+                "url": "https://api.github.com/repos/symfony/serializer/zipball/1538e02db55d8ba5b0c29f5062f471fe5b283704",
+                "reference": "1538e02db55d8ba5b0c29f5062f471fe5b283704",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9",
-                "symfony/polyfill-php55": "~1.0"
+                "php": ">=5.5.9"
+            },
+            "conflict": {
+                "symfony/property-access": ">=3.0,<3.0.4|>=2.8,<2.8.4",
+                "symfony/yaml": "<3.1"
             },
             "require-dev": {
                 "doctrine/annotations": "~1.0",
                 "doctrine/cache": "~1.0",
-                "symfony/config": "~2.2|~3.0.0",
-                "symfony/property-access": "~2.3|~3.0.0",
-                "symfony/yaml": "~2.0,>=2.0.5|~3.0.0"
+                "phpdocumentor/reflection-docblock": "~3.0",
+                "symfony/cache": "~3.1",
+                "symfony/config": "~2.8|~3.0",
+                "symfony/http-foundation": "~2.8|~3.0",
+                "symfony/property-access": "~2.8|~3.0",
+                "symfony/property-info": "~3.1",
+                "symfony/yaml": "~3.1"
             },
             "suggest": {
                 "doctrine/annotations": "For using the annotation mapping. You will also need doctrine/cache.",
                 "doctrine/cache": "For using the default cached annotation reader and metadata cache.",
+                "psr/cache-implementation": "For using the metadata cache.",
                 "symfony/config": "For using the XML mapping loader.",
+                "symfony/http-foundation": "To use the DataUriNormalizer.",
                 "symfony/property-access": "For using the ObjectNormalizer.",
+                "symfony/property-info": "To deserialize relations.",
                 "symfony/yaml": "For using the default YAML mapping loader."
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.8-dev"
+                    "dev-master": "3.2-dev"
                 }
             },
             "autoload": {
@@ -2252,34 +2056,34 @@
             ],
             "description": "Symfony Serializer Component",
             "homepage": "https://symfony.com",
-            "time": "2016-11-03 07:52:58"
+            "time": "2017-01-08 20:47:33"
         },
         {
             "name": "symfony/translation",
-            "version": "v2.8.15",
+            "version": "v3.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/translation.git",
-                "reference": "edbe67e8f729885b55421d5cc58223d48540df07"
+                "reference": "6520f3d4cce604d9dd1e86cac7af954984dd9bda"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/translation/zipball/edbe67e8f729885b55421d5cc58223d48540df07",
-                "reference": "edbe67e8f729885b55421d5cc58223d48540df07",
+                "url": "https://api.github.com/repos/symfony/translation/zipball/6520f3d4cce604d9dd1e86cac7af954984dd9bda",
+                "reference": "6520f3d4cce604d9dd1e86cac7af954984dd9bda",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9",
+                "php": ">=5.5.9",
                 "symfony/polyfill-mbstring": "~1.0"
             },
             "conflict": {
-                "symfony/config": "<2.7"
+                "symfony/config": "<2.8"
             },
             "require-dev": {
                 "psr/log": "~1.0",
-                "symfony/config": "~2.8",
-                "symfony/intl": "~2.4|~3.0.0",
-                "symfony/yaml": "~2.2|~3.0.0"
+                "symfony/config": "~2.8|~3.0",
+                "symfony/intl": "~2.8|~3.0",
+                "symfony/yaml": "~2.8|~3.0"
             },
             "suggest": {
                 "psr/log": "To use logging capability in translator",
@@ -2289,7 +2093,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.8-dev"
+                    "dev-master": "3.2-dev"
                 }
             },
             "autoload": {
@@ -2316,53 +2120,54 @@
             ],
             "description": "Symfony Translation Component",
             "homepage": "https://symfony.com",
-            "time": "2016-11-18 21:10:01"
+            "time": "2017-01-02 20:32:22"
         },
         {
             "name": "symfony/validator",
-            "version": "v2.8.15",
+            "version": "v3.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/validator.git",
-                "reference": "1a2bad8d4669f55dc4f9fcd26071b5e78fb37bce"
+                "reference": "506e0fe69ecdc595850c76081137116c0537d6e9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/validator/zipball/1a2bad8d4669f55dc4f9fcd26071b5e78fb37bce",
-                "reference": "1a2bad8d4669f55dc4f9fcd26071b5e78fb37bce",
+                "url": "https://api.github.com/repos/symfony/validator/zipball/506e0fe69ecdc595850c76081137116c0537d6e9",
+                "reference": "506e0fe69ecdc595850c76081137116c0537d6e9",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9",
+                "php": ">=5.5.9",
                 "symfony/polyfill-mbstring": "~1.0",
-                "symfony/translation": "~2.4|~3.0.0"
+                "symfony/translation": "~2.8|~3.0"
             },
             "require-dev": {
                 "doctrine/annotations": "~1.0",
                 "doctrine/cache": "~1.0",
-                "egulias/email-validator": "~1.2,>=1.2.1",
-                "symfony/config": "~2.2|~3.0.0",
-                "symfony/expression-language": "~2.4|~3.0.0",
-                "symfony/http-foundation": "~2.3|~3.0.0",
-                "symfony/intl": "~2.7.4|~2.8|~3.0.0",
-                "symfony/property-access": "~2.3|~3.0.0",
-                "symfony/yaml": "~2.0,>=2.0.5|~3.0.0"
+                "egulias/email-validator": "~1.2,>=1.2.8|~2.0",
+                "symfony/cache": "~3.1",
+                "symfony/config": "~2.8|~3.0",
+                "symfony/expression-language": "~2.8|~3.0",
+                "symfony/http-foundation": "~2.8|~3.0",
+                "symfony/intl": "~2.8|~3.0",
+                "symfony/yaml": "~2.8|~3.0"
             },
             "suggest": {
                 "doctrine/annotations": "For using the annotation mapping. You will also need doctrine/cache.",
                 "doctrine/cache": "For using the default cached annotation reader and metadata cache.",
                 "egulias/email-validator": "Strict (RFC compliant) email validation",
+                "psr/cache-implementation": "For using the metadata cache.",
                 "symfony/config": "",
-                "symfony/expression-language": "For using the 2.4 Expression validator",
+                "symfony/expression-language": "For using the Expression validator",
                 "symfony/http-foundation": "",
                 "symfony/intl": "",
-                "symfony/property-access": "For using the 2.4 Validator API",
+                "symfony/property-access": "For using the Expression validator",
                 "symfony/yaml": ""
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.8-dev"
+                    "dev-master": "3.2-dev"
                 }
             },
             "autoload": {
@@ -2389,29 +2194,35 @@
             ],
             "description": "Symfony Validator Component",
             "homepage": "https://symfony.com",
-            "time": "2016-12-08 15:59:39"
+            "time": "2017-01-12 19:27:47"
         },
         {
             "name": "symfony/yaml",
-            "version": "v2.8.15",
+            "version": "v3.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "befb26a3713c97af90d25dd12e75621ef14d91ff"
+                "reference": "50eadbd7926e31842893c957eca362b21592a97d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/befb26a3713c97af90d25dd12e75621ef14d91ff",
-                "reference": "befb26a3713c97af90d25dd12e75621ef14d91ff",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/50eadbd7926e31842893c957eca362b21592a97d",
+                "reference": "50eadbd7926e31842893c957eca362b21592a97d",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9"
+                "php": ">=5.5.9"
+            },
+            "require-dev": {
+                "symfony/console": "~2.8|~3.0"
+            },
+            "suggest": {
+                "symfony/console": "For validating YAML files using the lint command"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.8-dev"
+                    "dev-master": "3.2-dev"
                 }
             },
             "autoload": {
@@ -2438,7 +2249,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2016-11-14 16:15:57"
+            "time": "2017-01-03 13:51:32"
         },
         {
             "name": "twig/twig",
@@ -4105,16 +3916,16 @@
         },
         {
             "name": "symfony/browser-kit",
-            "version": "v3.2.1",
+            "version": "v3.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/browser-kit.git",
-                "reference": "34348c2691ce6254e8e008026f4c5e72c22bb318"
+                "reference": "548f8230bad9f77463b20b15993a008f03e96db5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/browser-kit/zipball/34348c2691ce6254e8e008026f4c5e72c22bb318",
-                "reference": "34348c2691ce6254e8e008026f4c5e72c22bb318",
+                "url": "https://api.github.com/repos/symfony/browser-kit/zipball/548f8230bad9f77463b20b15993a008f03e96db5",
+                "reference": "548f8230bad9f77463b20b15993a008f03e96db5",
                 "shasum": ""
             },
             "require": {
@@ -4158,29 +3969,29 @@
             ],
             "description": "Symfony BrowserKit Component",
             "homepage": "https://symfony.com",
-            "time": "2016-10-13 13:35:11"
+            "time": "2017-01-02 20:32:22"
         },
         {
             "name": "symfony/css-selector",
-            "version": "v2.8.15",
+            "version": "v3.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/css-selector.git",
-                "reference": "981abbbd6ba49af338a98490cbe29e7f39ca9fa9"
+                "reference": "f0e628f04fc055c934b3211cfabdb1c59eefbfaa"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/css-selector/zipball/981abbbd6ba49af338a98490cbe29e7f39ca9fa9",
-                "reference": "981abbbd6ba49af338a98490cbe29e7f39ca9fa9",
+                "url": "https://api.github.com/repos/symfony/css-selector/zipball/f0e628f04fc055c934b3211cfabdb1c59eefbfaa",
+                "reference": "f0e628f04fc055c934b3211cfabdb1c59eefbfaa",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9"
+                "php": ">=5.5.9"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.8-dev"
+                    "dev-master": "3.2-dev"
                 }
             },
             "autoload": {
@@ -4211,7 +4022,7 @@
             ],
             "description": "Symfony CssSelector Component",
             "homepage": "https://symfony.com",
-            "time": "2016-11-03 07:52:58"
+            "time": "2017-01-02 20:32:22"
         }
     ],
     "aliases": [],
diff --git a/core/composer.json b/core/composer.json
index 71f07d029f..2417e5d7ca 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -5,20 +5,20 @@
     "license": "GPL-2.0+",
     "require": {
         "php": ">=5.5.9",
-        "symfony/class-loader": "~2.8",
-        "symfony/console": "~2.8",
-        "symfony/dependency-injection": "~2.8",
-        "symfony/dom-crawler": ">=2.8.13 <3.0",
-        "symfony/event-dispatcher": "~2.8",
-        "symfony/http-foundation": "~2.8",
-        "symfony/http-kernel": "~2.8",
-        "symfony/routing": "~2.8",
-        "symfony/serializer": "~2.8",
-        "symfony/translation": "~2.8",
-        "symfony/validator": "~2.8",
-        "symfony/process": "~2.8",
+        "symfony/class-loader": "~3.2",
+        "symfony/console": "~3.2",
+        "symfony/dependency-injection": "~3.2",
+        "symfony/dom-crawler": "~3.2",
+        "symfony/event-dispatcher": "~3.2",
+        "symfony/http-foundation": "~3.2",
+        "symfony/http-kernel": "~3.2",
+        "symfony/routing": "~3.2",
+        "symfony/serializer": "~3.2",
+        "symfony/translation": "~3.2",
+        "symfony/validator": "~3.2",
+        "symfony/process": "~3.2",
         "symfony/polyfill-iconv": "~1.0",
-        "symfony/yaml": "~2.8",
+        "symfony/yaml": "~3.2",
         "twig/twig": "^1.23.1",
         "doctrine/common": "2.5.*",
         "doctrine/annotations": "1.2.*",
@@ -42,7 +42,7 @@
         "jcalderonzumba/mink-phantomjs-driver": "~0.3.1",
         "mikey179/vfsStream": "~1.2",
         "phpunit/phpunit": "~4.8",
-        "symfony/css-selector": "~2.8"
+        "symfony/css-selector": "~3.2"
     },
     "replace": {
         "drupal/action": "self.version",
diff --git a/core/lib/Drupal/Component/DependencyInjection/Container.php b/core/lib/Drupal/Component/DependencyInjection/Container.php
index 452a2c84d8..199f52b6c7 100644
--- a/core/lib/Drupal/Component/DependencyInjection/Container.php
+++ b/core/lib/Drupal/Component/DependencyInjection/Container.php
@@ -3,9 +3,7 @@
 namespace Drupal\Component\DependencyInjection;
 
 use Symfony\Component\DependencyInjection\ContainerInterface;
-use Symfony\Component\DependencyInjection\IntrospectableContainerInterface;
 use Symfony\Component\DependencyInjection\ResettableContainerInterface;
-use Symfony\Component\DependencyInjection\ScopeInterface;
 use Symfony\Component\DependencyInjection\Exception\LogicException;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
@@ -43,14 +41,10 @@
  *   getAServiceWithAnIdByCamelCase().
  * - The function getServiceIds() was added as it has a use-case in core and
  *   contrib.
- * - Scopes are explicitly not allowed, because Symfony 2.8 has deprecated
- *   them and they will be removed in Symfony 3.0.
- * - Synchronized services are explicitly not supported, because Symfony 2.8 has
- *   deprecated them and they will be removed in Symfony 3.0.
  *
  * @ingroup container
  */
-class Container implements IntrospectableContainerInterface, ResettableContainerInterface {
+class Container implements ContainerInterface, ResettableContainerInterface {
 
   /**
    * The parameters of the container.
@@ -311,12 +305,8 @@ protected function createService(array $definition, $id) {
       }
     }
 
-    // Share the service if it is public.
-    if (!isset($definition['public']) || $definition['public'] !== FALSE) {
-      // Forward compatibility fix for Symfony 2.8 update.
-      if (!isset($definition['shared']) || $definition['shared'] !== FALSE) {
-        $this->services[$id] = $service;
-      }
+    if (!isset($definition['shared']) || $definition['shared'] !== FALSE) {
+      $this->services[$id] = $service;
     }
 
     if (isset($definition['calls'])) {
@@ -361,11 +351,7 @@ protected function createService(array $definition, $id) {
   /**
    * {@inheritdoc}
    */
-  public function set($id, $service, $scope = ContainerInterface::SCOPE_CONTAINER) {
-    if (!in_array($scope, array('container', 'request')) || ('request' === $scope && 'request' !== $id)) {
-      @trigger_error('The concept of container scopes is deprecated since version 2.8 and will be removed in 3.0. Omit the third parameter.', E_USER_DEPRECATED);
-    }
-
+  public function set($id, $service) {
     $this->services[$id] = $service;
   }
 
@@ -587,61 +573,6 @@ protected function getParameterAlternatives($name) {
     return $this->getAlternatives($name, array_keys($this->parameters));
   }
 
-
-  /**
-   * {@inheritdoc}
-   */
-  public function enterScope($name) {
-    if ('request' !== $name) {
-      @trigger_error('The ' . __METHOD__ . ' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
-    }
-
-    throw new \BadMethodCallException(sprintf("'%s' is not supported by Drupal 8.", __FUNCTION__));
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function leaveScope($name) {
-    if ('request' !== $name) {
-      @trigger_error('The ' . __METHOD__ . ' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
-    }
-
-    throw new \BadMethodCallException(sprintf("'%s' is not supported by Drupal 8.", __FUNCTION__));
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function addScope(ScopeInterface $scope) {
-
-    $name = $scope->getName();
-    if ('request' !== $name) {
-      @trigger_error('The ' . __METHOD__ . ' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
-    }
-    throw new \BadMethodCallException(sprintf("'%s' is not supported by Drupal 8.", __FUNCTION__));
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function hasScope($name) {
-    if ('request' !== $name) {
-      @trigger_error('The ' . __METHOD__ . ' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
-    }
-
-    throw new \BadMethodCallException(sprintf("'%s' is not supported by Drupal 8.", __FUNCTION__));
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function isScopeActive($name) {
-    @trigger_error('The ' . __METHOD__ . ' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
-
-    throw new \BadMethodCallException(sprintf("'%s' is not supported by Drupal 8.", __FUNCTION__));
-  }
-
   /**
    * Gets all defined service IDs.
    *
diff --git a/core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php b/core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php
index 76a43fd2a5..f12649ef11 100644
--- a/core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php
+++ b/core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php
@@ -237,18 +237,6 @@ protected function getServiceDefinition(Definition $definition) {
       $service['calls'] = $this->dumpMethodCalls($definition->getMethodCalls());
     }
 
-    if (($scope = $definition->getScope()) !== ContainerInterface::SCOPE_CONTAINER) {
-      if ($scope === ContainerInterface::SCOPE_PROTOTYPE) {
-        // Scope prototype has been replaced with 'shared' => FALSE.
-        // This is a Symfony 2.8 forward compatibility fix.
-        // Reference: https://github.com/symfony/symfony/blob/2.8/UPGRADE-2.8.md#dependencyinjection
-        $service['shared'] = FALSE;
-      }
-      else {
-        throw new InvalidArgumentException("The 'scope' definition is deprecated in Symfony 3.0 and not supported by Drupal 8.");
-      }
-    }
-
     // By default services are shared, so just provide the flag, when needed.
     if ($definition->isShared() === FALSE) {
       $service['shared'] = $definition->isShared();
diff --git a/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php b/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php
index 3ec208630e..91577c331e 100644
--- a/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php
+++ b/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php
@@ -136,12 +136,8 @@ protected function createService(array $definition, $id) {
       }
     }
 
-    // Share the service if it is public.
-    if (!isset($definition['public']) || $definition['public'] !== FALSE) {
-      // Forward compatibility fix for Symfony 2.8 update.
-      if (!isset($definition['shared']) || $definition['shared'] !== FALSE) {
-        $this->services[$id] = $service;
-      }
+    if (!isset($definition['shared']) || $definition['shared'] !== FALSE) {
+      $this->services[$id] = $service;
     }
 
     if (isset($definition['calls'])) {
diff --git a/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php b/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php
index a933b06594..dcd724d200 100644
--- a/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php
+++ b/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php
@@ -2,7 +2,7 @@
 
 namespace Drupal\Component\EventDispatcher;
 
-use Symfony\Component\DependencyInjection\IntrospectableContainerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
@@ -36,7 +36,7 @@ class ContainerAwareEventDispatcher implements EventDispatcherInterface {
   /**
    * The service container.
    *
-   * @var \Symfony\Component\DependencyInjection\IntrospectableContainerInterface;
+   * @var \Symfony\Component\DependencyInjection\ContainerInterface;
    */
   protected $container;
 
@@ -66,7 +66,7 @@ class ContainerAwareEventDispatcher implements EventDispatcherInterface {
   /**
    * Constructs a container aware event dispatcher.
    *
-   * @param \Symfony\Component\DependencyInjection\IntrospectableContainerInterface $container
+   * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
    *   The service container.
    * @param array $listeners
    *   A nested array of listener definitions keyed by event name and priority.
@@ -77,7 +77,7 @@ class ContainerAwareEventDispatcher implements EventDispatcherInterface {
    *   A service entry will be resolved to a callable only just before its
    *   invocation.
    */
-  public function __construct(IntrospectableContainerInterface $container, array $listeners = []) {
+  public function __construct(ContainerInterface $container, array $listeners = []) {
     $this->container = $container;
     $this->listeners = $listeners;
     $this->unsorted = [];
@@ -91,9 +91,6 @@ public function dispatch($event_name, Event $event = NULL) {
       $event = new Event();
     }
 
-    $event->setDispatcher($this);
-    $event->setName($event_name);
-
     if (isset($this->listeners[$event_name])) {
       // Sort listeners if necessary.
       if (isset($this->unsorted[$event_name])) {
diff --git a/core/lib/Drupal/Component/Serialization/YamlPecl.php b/core/lib/Drupal/Component/Serialization/YamlPecl.php
index 2383bf849a..ec48a29ca6 100644
--- a/core/lib/Drupal/Component/Serialization/YamlPecl.php
+++ b/core/lib/Drupal/Component/Serialization/YamlPecl.php
@@ -27,6 +27,13 @@ public static function encode($data) {
    * {@inheritdoc}
    */
   public static function decode($raw) {
+    static $init;
+    if (!isset($init)) {
+      // Decode binary, since Symfony YAML parser encodes binary from 3.1
+      // onwards.
+      ini_set('yaml.decode_binary', 1);
+      $init = TRUE;
+    }
     // yaml_parse() will error with an empty value.
     if (!trim($raw)) {
       return NULL;
diff --git a/core/lib/Drupal/Component/Serialization/YamlSymfony.php b/core/lib/Drupal/Component/Serialization/YamlSymfony.php
index 8818e52534..390178f3f6 100644
--- a/core/lib/Drupal/Component/Serialization/YamlSymfony.php
+++ b/core/lib/Drupal/Component/Serialization/YamlSymfony.php
@@ -5,6 +5,7 @@
 use Drupal\Component\Serialization\Exception\InvalidDataTypeException;
 use Symfony\Component\Yaml\Parser;
 use Symfony\Component\Yaml\Dumper;
+use Symfony\Component\Yaml\Yaml as SymfonyYaml;
 
 /**
  * Default serialization for YAML using the Symfony component.
@@ -18,7 +19,7 @@ public static function encode($data) {
     try {
       $yaml = new Dumper();
       $yaml->setIndentation(2);
-      return $yaml->dump($data, PHP_INT_MAX, 0, TRUE, FALSE);
+      return $yaml->dump($data, PHP_INT_MAX, 0, SymfonyYaml::DUMP_EXCEPTION_ON_INVALID_TYPE);
     }
     catch (\Exception $e) {
       throw new InvalidDataTypeException($e->getMessage(), $e->getCode(), $e);
@@ -33,7 +34,7 @@ public static function decode($raw) {
       $yaml = new Parser();
       // Make sure we have a single trailing newline. A very simple config like
       // 'foo: bar' with no newline will fail to parse otherwise.
-      return $yaml->parse($raw, TRUE, FALSE);
+      return $yaml->parse($raw, SymfonyYaml::PARSE_EXCEPTION_ON_INVALID_TYPE);
     }
     catch (\Exception $e) {
       throw new InvalidDataTypeException($e->getMessage(), $e->getCode(), $e);
diff --git a/core/lib/Drupal/Core/DependencyInjection/Container.php b/core/lib/Drupal/Core/DependencyInjection/Container.php
index 4a491225b0..5643363316 100644
--- a/core/lib/Drupal/Core/DependencyInjection/Container.php
+++ b/core/lib/Drupal/Core/DependencyInjection/Container.php
@@ -3,7 +3,6 @@
 namespace Drupal\Core\DependencyInjection;
 
 use Drupal\Component\DependencyInjection\Container as DrupalContainer;
-use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Extends the Drupal container to set the service ID on the created object.
@@ -13,8 +12,8 @@ class Container extends DrupalContainer {
   /**
    * {@inheritdoc}
    */
-  public function set($id, $service, $scope = ContainerInterface::SCOPE_CONTAINER) {
-    parent::set($id, $service, $scope);
+  public function set($id, $service) {
+    parent::set($id, $service);
 
     // Ensure that the _serviceId property is set on synthetic services as well.
     if (isset($this->services[$id]) && is_object($this->services[$id]) && !isset($this->services[$id]->_serviceId)) {
diff --git a/core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php b/core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php
index e45cb884aa..e0becc71e2 100644
--- a/core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php
+++ b/core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php
@@ -46,20 +46,12 @@ private function getProxyInstantiator()
   }
 
   /**
-   * Direct copy of the parent function.
+   * {@inheritdoc}
    */
   protected function shareService(Definition $definition, $service, $id)
   {
-    if ($definition->isShared() && self::SCOPE_PROTOTYPE !== $scope = $definition->getScope(false)) {
-      if (self::SCOPE_CONTAINER !== $scope && !isset($this->scopedServices[$scope])) {
-        throw new InactiveScopeException($id, $scope);
-      }
-
+    if ($definition->isShared()) {
       $this->services[$lowerId = strtolower($id)] = $service;
-
-      if (self::SCOPE_CONTAINER !== $scope) {
-        $this->scopedServices[$scope][$lowerId] = $service;
-      }
     }
   }
 
@@ -74,11 +66,11 @@ protected function shareService(Definition $definition, $service, $id)
    *   ContainerBuilder class should be fixed to allow setting synthetic
    *   services in a frozen builder.
    */
-  public function set($id, $service, $scope = self::SCOPE_CONTAINER) {
+  public function set($id, $service) {
     if (strtolower($id) !== $id) {
       throw new \InvalidArgumentException("Service ID names must be lowercase: $id");
     }
-    SymfonyContainer::set($id, $service, $scope);
+    SymfonyContainer::set($id, $service);
 
     // Ensure that the _serviceId property is set on synthetic services as well.
     if (isset($this->services[$id]) && is_object($this->services[$id]) && !isset($this->services[$id]->_serviceId)) {
diff --git a/core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php b/core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php
index da1c08c2f5..d999450b0a 100644
--- a/core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php
+++ b/core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php
@@ -168,21 +168,10 @@ private function parseDefinition($id, $service, $file)
             $definition->setShared($service['shared']);
         }
 
-        if (isset($service['scope'])) {
-            if ('request' !== $id) {
-                @trigger_error(sprintf('The "scope" key of service "%s" in file "%s" is deprecated since version 2.8 and will be removed in 3.0.', $id, $file), E_USER_DEPRECATED);
-            }
-            $definition->setScope($service['scope'], false);
-        }
-
         if (isset($service['synthetic'])) {
             $definition->setSynthetic($service['synthetic']);
         }
 
-        if (isset($service['synchronized'])) {
-            $definition->setSynchronized($service['synchronized'], 'request' !== $id);
-        }
-
         if (isset($service['lazy'])) {
             $definition->setLazy($service['lazy']);
         }
@@ -213,15 +202,15 @@ private function parseDefinition($id, $service, $file)
         }
 
         if (isset($service['factory_class'])) {
-            $definition->setFactoryClass($service['factory_class']);
+            $definition->setFactory($service['factory_class']);
         }
 
         if (isset($service['factory_method'])) {
-            $definition->setFactoryMethod($service['factory_method']);
+            $definition->setFactory($service['factory_method']);
         }
 
         if (isset($service['factory_service'])) {
-            $definition->setFactoryService($service['factory_service']);
+            $definition->setFactory($service['factory_service']);
         }
 
         if (isset($service['file'])) {
diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 5c99840a92..7926623477 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -152,6 +152,13 @@ class DrupalKernel implements DrupalKernelInterface, TerminableInterface {
   protected $classLoader;
 
   /**
+   * The class loader class before including settings.php.
+   *
+   * @var string
+   */
+  protected $preSettingsClassLoaderClass;
+
+  /**
    * Config storage object used for reading enabled modules configuration.
    *
    * @var \Drupal\Core\Config\StorageInterface
@@ -890,6 +897,34 @@ protected function initializeContainer() {
       $container = new $class($container_definition);
     }
 
+    // If the class loader is still the same as before including settings.php
+    // use an optimised classloader if possible.
+    if ($this->preSettingsClassLoaderClass == get_class($this->classLoader)
+      && Settings::get('class_loader_auto_detect', TRUE)) {
+      $prefix = Settings::getApcuPrefix('class_loader', $this->root);
+      // We have to key by module list since if this changes the classloader
+      // might have negative caches for classes that now exist.
+      $prefix .= '.' . hash('sha1', serialize(array_keys($container->getParameter('container.modules'))));
+      $loader = NULL;
+
+      // We autodetect one of the following three optimized classloaders, if
+      // their underlying extension exists.
+      if (function_exists('apcu_fetch')) {
+        $loader = new ApcClassLoader($prefix, $this->classLoader);
+      }
+      elseif (extension_loaded('wincache')) {
+        $loader = new WinCacheClassLoader($prefix, $this->classLoader);
+      }
+      elseif (extension_loaded('xcache')) {
+        $loader = new XcacheClassLoader($prefix, $this->classLoader);
+      }
+      if (!empty($loader)) {
+        $this->classLoader->unregister();
+        $loader->register();
+        $this->classLoader = $loader;
+      }
+    }
+
     $this->attachSynthetic($container);
 
     $this->container = $container;
@@ -1018,7 +1053,7 @@ public static function bootEnvironment($app_root = NULL) {
   protected function initializeSettings(Request $request) {
     $site_path = static::findSitePath($request);
     $this->setSitePath($site_path);
-    $class_loader_class = get_class($this->classLoader);
+    $this->preSettingsClassLoaderClass = get_class($this->classLoader);
     Settings::initialize($this->root, $site_path, $this->classLoader);
 
     // Initialize our list of trusted HTTP Host headers to protect against
@@ -1029,38 +1064,6 @@ protected function initializeSettings(Request $request) {
         throw new BadRequestHttpException('The provided host name is not valid for this server.');
       }
     }
-
-    // If the class loader is still the same, possibly
-    // upgrade to an optimized class loader.
-    if ($class_loader_class == get_class($this->classLoader)
-        && Settings::get('class_loader_auto_detect', TRUE)) {
-      $prefix = Settings::getApcuPrefix('class_loader', $this->root);
-      $loader = NULL;
-
-      // We autodetect one of the following three optimized classloaders, if
-      // their underlying extension exists.
-      if (function_exists('apcu_fetch')) {
-        $loader = new ApcClassLoader($prefix, $this->classLoader);
-      }
-      elseif (extension_loaded('wincache')) {
-        $loader = new WinCacheClassLoader($prefix, $this->classLoader);
-      }
-      elseif (extension_loaded('xcache')) {
-        $loader = new XcacheClassLoader($prefix, $this->classLoader);
-      }
-      if (!empty($loader)) {
-        $this->classLoader->unregister();
-        $loader->register();
-        $old_loader = $this->classLoader;
-        $this->classLoader = $loader;
-        // The optimized classloader might be persistent and store cache misses.
-        // For example, once a cache miss is stored in APCu clearing it on a
-        // specific web-head will not clear any other web-heads. Therefore
-        // fallback to the composer class loader that only statically caches
-        // misses.
-        $old_loader->register();
-      }
-    }
   }
 
   /**
diff --git a/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
index 3db181adc8..252d200b08 100644
--- a/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
@@ -174,9 +174,9 @@ public function onRespond(FilterResponseEvent $event) {
    *
    * When neither Cache-Control nor any of the ETag, Last-Modified, Expires
    * headers are set on the response, ::get('Cache-Control') returns the value
-   * 'no-cache'. If any of ETag, Last-Modified or Expires are set but not
-   * Cache-Control, then 'private, must-revalidate' (in exactly this order) is
-   * returned.
+   * 'no-cache, private'. If any of ETag, Last-Modified or Expires are set but
+   * not Cache-Control, then 'private, must-revalidate' (in exactly this order)
+   * is returned.
    *
    * @see \Symfony\Component\HttpFoundation\ResponseHeaderBag::computeCacheControlValue()
    *
@@ -187,7 +187,7 @@ public function onRespond(FilterResponseEvent $event) {
    */
   protected function isCacheControlCustomized(Response $response) {
     $cache_control = $response->headers->get('Cache-Control');
-    return $cache_control != 'no-cache' && $cache_control != 'private, must-revalidate';
+    return $cache_control != 'no-cache, private' && $cache_control != 'private, must-revalidate';
   }
 
   /**
diff --git a/core/lib/Drupal/Core/PageCache/RequestPolicy/CommandLineOrUnsafeMethod.php b/core/lib/Drupal/Core/PageCache/RequestPolicy/CommandLineOrUnsafeMethod.php
index bbf85a33e9..27a1f7120d 100644
--- a/core/lib/Drupal/Core/PageCache/RequestPolicy/CommandLineOrUnsafeMethod.php
+++ b/core/lib/Drupal/Core/PageCache/RequestPolicy/CommandLineOrUnsafeMethod.php
@@ -18,7 +18,7 @@ class CommandLineOrUnsafeMethod implements RequestPolicyInterface {
    * {@inheritdoc}
    */
   public function check(Request $request) {
-    if ($this->isCli() || !$request->isMethodSafe()) {
+    if ($this->isCli() || !$request->isMethodCacheable()) {
       return static::DENY;
     }
   }
diff --git a/core/lib/Drupal/Core/Render/PlaceholderingRenderCache.php b/core/lib/Drupal/Core/Render/PlaceholderingRenderCache.php
index 42562834b8..0422ecf5eb 100644
--- a/core/lib/Drupal/Core/Render/PlaceholderingRenderCache.php
+++ b/core/lib/Drupal/Core/Render/PlaceholderingRenderCache.php
@@ -93,7 +93,7 @@ public function __construct(RequestStack $request_stack, CacheFactoryInterface $
    */
   public function get(array $elements) {
     // @todo remove this check when https://www.drupal.org/node/2367555 lands.
-    if (!$this->requestStack->getCurrentRequest()->isMethodSafe()) {
+    if (!$this->requestStack->getCurrentRequest()->isMethodCacheable()) {
       return FALSE;
     }
 
@@ -127,7 +127,7 @@ public function set(array &$elements, array $pre_bubbling_elements) {
     $result = parent::set($elements, $pre_bubbling_elements);
 
     // @todo remove this check when https://www.drupal.org/node/2367555 lands.
-    if (!$this->requestStack->getCurrentRequest()->isMethodSafe()) {
+    if (!$this->requestStack->getCurrentRequest()->isMethodCacheable()) {
       return FALSE;
     }
 
diff --git a/core/lib/Drupal/Core/Render/RenderCache.php b/core/lib/Drupal/Core/Render/RenderCache.php
index 12d52e936b..9ac338124c 100644
--- a/core/lib/Drupal/Core/Render/RenderCache.php
+++ b/core/lib/Drupal/Core/Render/RenderCache.php
@@ -61,9 +61,9 @@ public function __construct(RequestStack $request_stack, CacheFactoryInterface $
   public function get(array $elements) {
     // Form submissions rely on the form being built during the POST request,
     // and render caching of forms prevents this from happening.
-    // @todo remove the isMethodSafe() check when
+    // @todo remove the isMethodCacheable() check when
     //       https://www.drupal.org/node/2367555 lands.
-    if (!$this->requestStack->getCurrentRequest()->isMethodSafe() || !$cid = $this->createCacheID($elements)) {
+    if (!$this->requestStack->getCurrentRequest()->isMethodCacheable() || !$cid = $this->createCacheID($elements)) {
       return FALSE;
     }
     $bin = isset($elements['#cache']['bin']) ? $elements['#cache']['bin'] : 'render';
@@ -88,9 +88,9 @@ public function get(array $elements) {
   public function set(array &$elements, array $pre_bubbling_elements) {
     // Form submissions rely on the form being built during the POST request,
     // and render caching of forms prevents this from happening.
-    // @todo remove the isMethodSafe() check when
+    // @todo remove the isMethodCacheable() check when
     //       https://www.drupal.org/node/2367555 lands.
-    if (!$this->requestStack->getCurrentRequest()->isMethodSafe() || !$cid = $this->createCacheID($elements)) {
+    if (!$this->requestStack->getCurrentRequest()->isMethodCacheable() || !$cid = $this->createCacheID($elements)) {
       return FALSE;
     }
 
diff --git a/core/lib/Drupal/Core/Render/Renderer.php b/core/lib/Drupal/Core/Render/Renderer.php
index 4bbffc3e70..37767dc3b1 100644
--- a/core/lib/Drupal/Core/Render/Renderer.php
+++ b/core/lib/Drupal/Core/Render/Renderer.php
@@ -338,9 +338,9 @@ protected function doRender(&$elements, $is_root_call = FALSE) {
     // If instructed to create a placeholder, and a #lazy_builder callback is
     // present (without such a callback, it would be impossible to replace the
     // placeholder), replace the current element with a placeholder.
-    // @todo remove the isMethodSafe() check when
+    // @todo remove the isMethodCacheable() check when
     //       https://www.drupal.org/node/2367555 lands.
-    if (isset($elements['#create_placeholder']) && $elements['#create_placeholder'] === TRUE && $this->requestStack->getCurrentRequest()->isMethodSafe()) {
+    if (isset($elements['#create_placeholder']) && $elements['#create_placeholder'] === TRUE && $this->requestStack->getCurrentRequest()->isMethodCacheable()) {
       if (!isset($elements['#lazy_builder'])) {
         throw new \LogicException('When #create_placeholder is set, a #lazy_builder callback must be present as well.');
       }
diff --git a/core/lib/Drupal/Core/TypedData/Validation/ExecutionContext.php b/core/lib/Drupal/Core/TypedData/Validation/ExecutionContext.php
index a20fa527a5..100718e45b 100644
--- a/core/lib/Drupal/Core/TypedData/Validation/ExecutionContext.php
+++ b/core/lib/Drupal/Core/TypedData/Validation/ExecutionContext.php
@@ -21,7 +21,7 @@
 class ExecutionContext implements ExecutionContextInterface {
 
   /**
-   * @var \Symfony\Component\Validator\ValidatorInterface
+   * @var \Symfony\Component\Validator\Validator\ValidatorInterface
    */
   protected $validator;
 
diff --git a/core/modules/big_pipe/src/Render/Placeholder/BigPipeStrategy.php b/core/modules/big_pipe/src/Render/Placeholder/BigPipeStrategy.php
index 46a20c68da..9d3c84b705 100644
--- a/core/modules/big_pipe/src/Render/Placeholder/BigPipeStrategy.php
+++ b/core/modules/big_pipe/src/Render/Placeholder/BigPipeStrategy.php
@@ -109,7 +109,7 @@ public function processPlaceholders(array $placeholders) {
     $request = $this->requestStack->getCurrentRequest();
 
     // @todo remove this check when https://www.drupal.org/node/2367555 lands.
-    if (!$request->isMethodSafe()) {
+    if (!$request->isMethodCacheable()) {
       return [];
     }
 
diff --git a/core/modules/big_pipe/tests/src/Unit/Render/Placeholder/BigPipeStrategyTest.php b/core/modules/big_pipe/tests/src/Unit/Render/Placeholder/BigPipeStrategyTest.php
index f0f40ba29d..9de09424b8 100644
--- a/core/modules/big_pipe/tests/src/Unit/Render/Placeholder/BigPipeStrategyTest.php
+++ b/core/modules/big_pipe/tests/src/Unit/Render/Placeholder/BigPipeStrategyTest.php
@@ -47,7 +47,7 @@ public function testProcessPlaceholders(array $placeholders, $method, $route_mat
     $big_pipe_strategy = new BigPipeStrategy($session_configuration->reveal(), $request_stack->reveal(), $route_match->reveal());
     $processed_placeholders = $big_pipe_strategy->processPlaceholders($placeholders);
 
-    if ($request->isMethodSafe() && !$route_match_has_no_big_pipe_option && $request_has_session) {
+    if ($request->isMethodCacheable() && !$route_match_has_no_big_pipe_option && $request_has_session) {
       $this->assertSameSize($expected_big_pipe_placeholders, $processed_placeholders, 'BigPipe is able to deliver all placeholders.');
       foreach (array_keys($placeholders) as $placeholder) {
         $this->assertSame($expected_big_pipe_placeholders[$placeholder], $processed_placeholders[$placeholder], "Verifying how BigPipeStrategy handles the placeholder '$placeholder'");
diff --git a/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php b/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php
index 7eefdc7a2b..5db7b2a0f7 100644
--- a/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php
+++ b/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php
@@ -76,7 +76,7 @@ public function testBlock() {
     // Render the block.
     // @todo The request stack manipulation won't be necessary once
     //   https://www.drupal.org/node/2367555 is fixed and the
-    //   corresponding $request->isMethodSafe() checks are removed from
+    //   corresponding $request->isMethodCacheable() checks are removed from
     //   Drupal\Core\Render\Renderer.
     $request_stack = $this->container->get('request_stack');
     $request_stack->push(new Request());
diff --git a/core/modules/file/config/optional/views.view.files.yml b/core/modules/file/config/optional/views.view.files.yml
index e5edee2e40..053b72df45 100644
--- a/core/modules/file/config/optional/views.view.files.yml
+++ b/core/modules/file/config/optional/views.view.files.yml
@@ -565,7 +565,7 @@ display:
           decimal: .
           separator: ','
           format_plural: true
-          format_plural_string: "1 place\x03@count places"
+          format_plural_string: !!binary MSBwbGFjZQNAY291bnQgcGxhY2Vz
           prefix: ''
           suffix: ''
           plugin_id: numeric
@@ -1007,7 +1007,7 @@ display:
           decimal: .
           separator: ','
           format_plural: false
-          format_plural_string: "1\x03@count"
+          format_plural_string: !!binary MQNAY291bnQ=
           prefix: ''
           suffix: ''
           plugin_id: numeric
diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index 5c86a137ae..5c673172ce 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -1080,7 +1080,7 @@ function node_query_node_access_alter(AlterableInterface $query) {
   // context.
   $request = \Drupal::requestStack()->getCurrentRequest();
   $renderer = \Drupal::service('renderer');
-  if ($request->isMethodSafe() && $renderer->hasRenderContext()) {
+  if ($request->isMethodCacheable() && $renderer->hasRenderContext()) {
     $build = ['#cache' => ['contexts' => ['user.node_grants:' . $op]]];
     $renderer->render($build);
   }
diff --git a/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php b/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php
index 5cb887bec0..86935ea1cc 100644
--- a/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php
+++ b/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php
@@ -96,7 +96,7 @@ public function getResponseFormat(RouteMatchInterface $route_match, Request $req
     $route = $route_match->getRouteObject();
     $acceptable_request_formats = $route->hasRequirement('_format') ? explode('|', $route->getRequirement('_format')) : [];
     $acceptable_content_type_formats = $route->hasRequirement('_content_type_format') ? explode('|', $route->getRequirement('_content_type_format')) : [];
-    $acceptable_formats = $request->isMethodSafe() ? $acceptable_request_formats : $acceptable_content_type_formats;
+    $acceptable_formats = $request->isMethodCacheable() ? $acceptable_request_formats : $acceptable_content_type_formats;
 
     $requested_format = $request->getRequestFormat();
     $content_type_format = $request->getContentType();
diff --git a/core/modules/rest/tests/src/Unit/CollectRoutesTest.php b/core/modules/rest/tests/src/Unit/CollectRoutesTest.php
index c55ea3bbf3..5c4de33a5e 100644
--- a/core/modules/rest/tests/src/Unit/CollectRoutesTest.php
+++ b/core/modules/rest/tests/src/Unit/CollectRoutesTest.php
@@ -141,8 +141,8 @@ public function testRoutesRequirements() {
     $requirements_1 = $this->routes->get('test_1')->getRequirements();
     $requirements_2 = $this->routes->get('view.test_view.page_1')->getRequirements();
 
-    $this->assertEquals(count($requirements_1), 0, 'First route has no requirement.');
-    $this->assertEquals(count($requirements_2), 2, 'Views route with rest export had the format and method requirements added.');
+    $this->assertEquals(0, count($requirements_1), 'First route has no requirement.');
+    $this->assertEquals(1, count($requirements_2), 'Views route with rest export had the format requirement added.');
 
     // Check auth options.
     $auth = $this->routes->get('view.test_view.page_1')->getOption('_auth');
diff --git a/core/modules/rest/tests/src/Unit/EventSubscriber/ResourceResponseSubscriberTest.php b/core/modules/rest/tests/src/Unit/EventSubscriber/ResourceResponseSubscriberTest.php
index b16a13119f..d09fdced4c 100644
--- a/core/modules/rest/tests/src/Unit/EventSubscriber/ResourceResponseSubscriberTest.php
+++ b/core/modules/rest/tests/src/Unit/EventSubscriber/ResourceResponseSubscriberTest.php
@@ -79,11 +79,6 @@ public function providerTestSerialization() {
    * @dataProvider providerTestResponseFormat
    */
   public function testResponseFormat($methods, array $supported_formats, $request_format, array $request_headers, $request_body, $expected_response_format, $expected_response_content_type, $expected_response_content) {
-    $parameters = [];
-    if ($request_format !== FALSE) {
-      $parameters['_format'] = $request_format;
-    }
-
     foreach ($request_headers as $key => $value) {
       unset($request_headers[$key]);
       $key = strtoupper(str_replace('-', '_', $key));
@@ -91,8 +86,13 @@ public function testResponseFormat($methods, array $supported_formats, $request_
     }
 
     foreach ($methods as $method) {
-      $request = Request::create('/rest/test', $method, $parameters, [], [], $request_headers, $request_body);
-      $route_requirement_key_format = $request->isMethodSafe() ? '_format' : '_content_type_format';
+      $request = Request::create('/rest/test', $method, [], [], [], $request_headers, $request_body);
+      // \Drupal\Core\StackMiddleware\NegotiationMiddleware normally takes care
+      // of this so we'll hard code it here.
+      if ($request_format) {
+        $request->setRequestFormat($request_format);
+      }
+      $route_requirement_key_format = $request->isMethodCacheable() ? '_format' : '_content_type_format';
       $route_match = new RouteMatch('test', new Route('/rest/test', ['_rest_resource_config' => $this->randomMachineName()], [$route_requirement_key_format => implode('|', $supported_formats)]));
 
       $resource_response_subscriber = new ResourceResponseSubscriber(
@@ -116,11 +116,6 @@ public function testResponseFormat($methods, array $supported_formats, $request_
   public function testOnResponseWithCacheableResponse($methods, array $supported_formats, $request_format, array $request_headers, $request_body, $expected_response_format, $expected_response_content_type, $expected_response_content) {
     $rest_config_name = $this->randomMachineName();
 
-    $parameters = [];
-    if ($request_format !== FALSE) {
-      $parameters['_format'] = $request_format;
-    }
-
     foreach ($request_headers as $key => $value) {
       unset($request_headers[$key]);
       $key = strtoupper(str_replace('-', '_', $key));
@@ -128,8 +123,13 @@ public function testOnResponseWithCacheableResponse($methods, array $supported_f
     }
 
     foreach ($methods as $method) {
-      $request = Request::create('/rest/test', $method, $parameters, [], [], $request_headers, $request_body);
-      $route_requirement_key_format = $request->isMethodSafe() ? '_format' : '_content_type_format';
+      $request = Request::create('/rest/test', $method, [], [], [], $request_headers, $request_body);
+      // \Drupal\Core\StackMiddleware\NegotiationMiddleware normally takes care
+      // of this so we'll hard code it here.
+      if ($request_format) {
+        $request->setRequestFormat($request_format);
+      }
+      $route_requirement_key_format = $request->isMethodCacheable() ? '_format' : '_content_type_format';
       $route_match = new RouteMatch('test', new Route('/rest/test', ['_rest_resource_config' => $rest_config_name], [$route_requirement_key_format => implode('|', $supported_formats)]));
 
       // The RequestHandler must return a ResourceResponseInterface object.
@@ -166,11 +166,6 @@ public function testOnResponseWithCacheableResponse($methods, array $supported_f
   public function testOnResponseWithUncacheableResponse($methods, array $supported_formats, $request_format, array $request_headers, $request_body, $expected_response_format, $expected_response_content_type, $expected_response_content) {
     $rest_config_name = $this->randomMachineName();
 
-    $parameters = [];
-    if ($request_format !== FALSE) {
-      $parameters['_format'] = $request_format;
-    }
-
     foreach ($request_headers as $key => $value) {
       unset($request_headers[$key]);
       $key = strtoupper(str_replace('-', '_', $key));
@@ -178,8 +173,13 @@ public function testOnResponseWithUncacheableResponse($methods, array $supported
     }
 
     foreach ($methods as $method) {
-      $request = Request::create('/rest/test', $method, $parameters, [], [], $request_headers, $request_body);
-      $route_requirement_key_format = $request->isMethodSafe() ? '_format' : '_content_type_format';
+      $request = Request::create('/rest/test', $method, [], [], [], $request_headers, $request_body);
+      // \Drupal\Core\StackMiddleware\NegotiationMiddleware normally takes care
+      // of this so we'll hard code it here.
+      if ($request_format) {
+        $request->setRequestFormat($request_format);
+      }
+      $route_requirement_key_format = $request->isMethodCacheable() ? '_format' : '_content_type_format';
       $route_match = new RouteMatch('test', new Route('/rest/test', ['_rest_resource_config' => $rest_config_name], [$route_requirement_key_format => implode('|', $supported_formats)]));
 
       // The RequestHandler must return a ResourceResponseInterface object.
diff --git a/core/modules/system/tests/modules/form_test/src/Form/FormTestStorageForm.php b/core/modules/system/tests/modules/form_test/src/Form/FormTestStorageForm.php
index 948c592cee..fb28c65baa 100644
--- a/core/modules/system/tests/modules/form_test/src/Form/FormTestStorageForm.php
+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestStorageForm.php
@@ -86,7 +86,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     //   that issue.
     if ($this->getRequest()->get('immutable')) {
       $form_state->addBuildInfo('immutable', TRUE);
-      if ($this->getRequest()->get('cache') && $this->getRequest()->isMethodSafe()) {
+      if ($this->getRequest()->get('cache') && $this->getRequest()->isMethodCacheable()) {
         $form_state->setRequestMethod('FAKE');
         $form_state->setCached();
       }
diff --git a/core/modules/system/tests/modules/theme_test/src/EventSubscriber/ThemeTestSubscriber.php b/core/modules/system/tests/modules/theme_test/src/EventSubscriber/ThemeTestSubscriber.php
index d5f9110a7f..bc8d1d09a8 100644
--- a/core/modules/system/tests/modules/theme_test/src/EventSubscriber/ThemeTestSubscriber.php
+++ b/core/modules/system/tests/modules/theme_test/src/EventSubscriber/ThemeTestSubscriber.php
@@ -17,7 +17,8 @@ class ThemeTestSubscriber implements EventSubscriberInterface {
   /**
    * The used container.
    *
-   * @var \Symfony\Component\DependencyInjection\IntrospectableContainerInterface
+   * @todo This variable is never initialzed, so we don't know what it is.
+   *   See https://www.drupal.org/node/2721315
    */
   protected $container;
 
diff --git a/core/tests/Drupal/Tests/Component/DependencyInjection/ContainerTest.php b/core/tests/Drupal/Tests/Component/DependencyInjection/ContainerTest.php
index c818bc6a77..d507bab29a 100644
--- a/core/tests/Drupal/Tests/Component/DependencyInjection/ContainerTest.php
+++ b/core/tests/Drupal/Tests/Component/DependencyInjection/ContainerTest.php
@@ -664,47 +664,6 @@ public function testInitializedForAliases() {
   }
 
   /**
-   * Tests that unsupported methods throw an Exception.
-   *
-   * @covers ::enterScope
-   * @covers ::leaveScope
-   * @covers ::addScope
-   * @covers ::hasScope
-   * @covers ::isScopeActive
-   *
-   * @expectedException \BadMethodCallException
-   *
-   * @dataProvider scopeExceptionTestProvider
-   */
-  public function testScopeFunctionsWithException($method, $argument) {
-    $callable = array(
-      $this->container,
-      $method,
-    );
-
-    $callable($argument);
-  }
-
-  /**
-   * Data provider for scopeExceptionTestProvider().
-   *
-   * @return array[]
-   *   Returns per data set an array with:
-   *     - method name to call
-   *     - argument to pass
-   */
-  public function scopeExceptionTestProvider() {
-    $scope = $this->prophesize('\Symfony\Component\DependencyInjection\ScopeInterface')->reveal();
-    return array(
-      array('enterScope', 'test_scope'),
-      array('leaveScope', 'test_scope'),
-      array('hasScope', 'test_scope'),
-      array('isScopeActive', 'test_scope'),
-      array('addScope', $scope),
-    );
-  }
-
-  /**
    * Tests that Container::getServiceIds() works properly.
    *
    * @covers ::getServiceIds
diff --git a/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumperTest.php b/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumperTest.php
index 5a6b3190fe..f625734f72 100644
--- a/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumperTest.php
+++ b/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumperTest.php
@@ -246,7 +246,6 @@ public function getDefinitionsDataProvider() {
         'arguments_count' => 0,
         'properties' => array(),
         'calls' => array(),
-        'scope' => ContainerInterface::SCOPE_CONTAINER,
         'shared' => TRUE,
         'factory' => FALSE,
         'configurator' => FALSE,
@@ -359,11 +358,6 @@ public function getDefinitionsDataProvider() {
       ) + $base_service_definition;
 
       $service_definitions[] = array(
-        'scope' => ContainerInterface::SCOPE_PROTOTYPE,
-        'shared' => FALSE,
-      ) + $base_service_definition;
-
-      $service_definitions[] = array(
           'shared' => FALSE,
         ) + $base_service_definition;
 
@@ -405,7 +399,6 @@ public function getDefinitionsDataProvider() {
         $definition->getArguments()->willReturn($service_definition['arguments']);
         $definition->getProperties()->willReturn($service_definition['properties']);
         $definition->getMethodCalls()->willReturn($service_definition['calls']);
-        $definition->getScope()->willReturn($service_definition['scope']);
         $definition->isShared()->willReturn($service_definition['shared']);
         $definition->getDecoratedService()->willReturn(NULL);
         $definition->getFactory()->willReturn($service_definition['factory']);
@@ -438,9 +431,6 @@ public function getDefinitionsDataProvider() {
           }
         }
 
-        // Remove any remaining scope.
-        unset($filtered_service_definition['scope']);
-
         if (isset($filtered_service_definition['public']) && $filtered_service_definition['public'] === FALSE) {
           $services_provided[] = array(
             array('foo_service' => $definition->reveal()),
@@ -479,22 +469,6 @@ protected function getServiceCall($id, $invalid_behavior = ContainerInterface::E
     }
 
     /**
-     * Tests that the correct InvalidArgumentException is thrown for getScope().
-     *
-     * @covers ::getServiceDefinition
-     *
-     * @expectedException \Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
-     */
-    public function testGetServiceDefinitionWithInvalidScope() {
-      $bar_definition = new Definition('\stdClass');
-      $bar_definition->setScope('foo_scope');
-      $services['bar'] = $bar_definition;
-
-      $this->containerBuilder->getDefinitions()->willReturn($services);
-      $this->dumper->getArray();
-    }
-
-    /**
      * Tests that references to aliases work correctly.
      *
      * @covers ::getReferenceCall
diff --git a/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php b/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php
index 7bc2382b1f..ea0685a717 100644
--- a/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php
+++ b/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php
@@ -6,9 +6,10 @@
 use Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\EventDispatcher\Tests\CallableClass;
-use Symfony\Component\EventDispatcher\Tests\TestEventListener;
 use Symfony\Component\EventDispatcher\Tests\ContainerAwareEventDispatcherTest as SymfonyContainerAwareEventDispatcherTest;
+use Symfony\Component\EventDispatcher\Tests\TestEventListener;
 
 /**
  * Unit tests for the ContainerAwareEventDispatcher.
@@ -37,7 +38,7 @@ public function testGetListenersWithCallables()
         // When passing in callables exclusively as listeners into the event
         // dispatcher constructor, the event dispatcher must not attempt to
         // resolve any services.
-        $container = $this->getMock('Symfony\Component\DependencyInjection\IntrospectableContainerInterface');
+        $container = $this->getMock(ContainerInterface::class);
         $container->expects($this->never())->method($this->anything());
 
         $firstListener = new CallableClass();
@@ -72,7 +73,7 @@ public function testDispatchWithCallables()
         // When passing in callables exclusively as listeners into the event
         // dispatcher constructor, the event dispatcher must not attempt to
         // resolve any services.
-        $container = $this->getMock('Symfony\Component\DependencyInjection\IntrospectableContainerInterface');
+        $container = $this->getMock(ContainerInterface::class);
         $container->expects($this->never())->method($this->anything());
 
         $firstListener = new CallableClass();
diff --git a/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php b/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
index cb7353376c..24e23ddf07 100644
--- a/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
@@ -10,6 +10,7 @@
 use Drupal\Core\TypedData\TypedDataManagerInterface;
 use Drupal\Tests\UnitTestCase;
 use Drupal\Core\Language\Language;
+use Symfony\Component\Validator\Validator\ValidatorInterface;
 
 /**
  * @coversDefaultClass \Drupal\Core\Entity\ContentEntityBase
@@ -321,7 +322,7 @@ public function testPreSaveRevision() {
    * @covers ::validate
    */
   public function testValidate() {
-    $validator = $this->getMock('\Symfony\Component\Validator\ValidatorInterface');
+    $validator = $this->getMock(ValidatorInterface::class);
     /** @var \Symfony\Component\Validator\ConstraintViolationList|\PHPUnit_Framework_MockObject_MockObject $empty_violation_list */
     $empty_violation_list = $this->getMockBuilder('\Symfony\Component\Validator\ConstraintViolationList')
       ->setMethods(NULL)
@@ -357,7 +358,7 @@ public function testValidate() {
    * @expectedExceptionMessage Entity validation was skipped.
    */
   public function testRequiredValidation() {
-    $validator = $this->getMock('\Symfony\Component\Validator\ValidatorInterface');
+    $validator = $this->getMock(ValidatorInterface::class);
     /** @var \Symfony\Component\Validator\ConstraintViolationList|\PHPUnit_Framework_MockObject_MockObject $empty_violation_list */
     $empty_violation_list = $this->getMockBuilder('\Symfony\Component\Validator\ConstraintViolationList')
       ->setMethods(NULL)
diff --git a/core/tests/Drupal/Tests/Core/EventSubscriber/DefaultExceptionSubscriberTest.php b/core/tests/Drupal/Tests/Core/EventSubscriber/DefaultExceptionSubscriberTest.php
index 541d13636b..61f0cd139b 100644
--- a/core/tests/Drupal/Tests/Core/EventSubscriber/DefaultExceptionSubscriberTest.php
+++ b/core/tests/Drupal/Tests/Core/EventSubscriber/DefaultExceptionSubscriberTest.php
@@ -25,7 +25,10 @@ public function testOnExceptionWithUnknownFormat() {
 
     // Format 'bananas' requested, yet only 'json' allowed.
     $kernel = $this->prophesize(HttpKernelInterface::class);
-    $request = Request::create('/test?_format=bananas');
+    $request = Request::create('/test');
+    // \Drupal\Core\StackMiddleware\NegotiationMiddleware normally takes care
+    // of this so we'll hard code it here.
+    $request->setRequestFormat('bananas');
     $e = new MethodNotAllowedHttpException(['json'], 'test message');
     $event = new GetResponseForExceptionEvent($kernel->reveal(), $request, 'GET', $e);
     $subscriber = new DefaultExceptionSubscriber($config_factory);