diff --git a/core/core.services.yml b/core/core.services.yml
index 8dc5a92..109f274 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -1287,10 +1287,6 @@ services:
     class: Drupal\Core\StreamWrapper\ProfileStream
     tags:
       - { name: stream_wrapper, scheme: profile }
-  stream_wrapper.library:
-    class: Drupal\Core\StreamWrapper\LibraryStream
-    tags:
-      - { name: stream_wrapper, scheme: library }
   kernel_destruct_subscriber:
     class: Drupal\Core\EventSubscriber\KernelDestructionSubscriber
     tags:
diff --git a/core/lib/Drupal/Core/Extension/LibraryDiscovery.php b/core/lib/Drupal/Core/Extension/LibraryDiscovery.php
deleted file mode 100644
index cdfb1ce..0000000
--- a/core/lib/Drupal/Core/Extension/LibraryDiscovery.php
+++ /dev/null
@@ -1,97 +0,0 @@
-<?php
-
-namespace Drupal\Core\Extension;
-
-/**
- * Discovers available libraries in the filesystem.
- */
-class LibraryDiscovery extends ExtensionDiscovery {
-
-  /**
-   * The directory libraries are registered in.
-   */
-  const LIBRARIES_DIRECTORY = 'libraries';
-
-  /**
-   * The type of this extension.
-   */
-  const EXTENSION_TYPE = 'library';
-
-  /**
-   * We don't want to affect the static cache of the core ExtensionDiscovery
-   * class, so we keep one separately.
-   *
-   * @var array
-   */
-  protected static $files = array();
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function scanDirectory($dir, $include_tests) {
-    $files = array();
-
-    // In order to scan top-level directories, absolute directory paths have to
-    // be used (which also improves performance, since any configured PHP
-    // include_paths will not be consulted). Retain the relative originating
-    // directory being scanned, so relative paths can be reconstructed below
-    // (all paths are expected to be relative to $this->root).
-    $dir_prefix = ($dir == '' ? '' : "$dir/") . self::LIBRARIES_DIRECTORY . '/';
-    $absolute_dir = ($dir == '' ? $this->root : $this->root . "/$dir");
-    $absolute_dir .= '/' . self::LIBRARIES_DIRECTORY;
-
-    if (!is_dir($absolute_dir)) {
-      return $files;
-    }
-    // Use Unix paths regardless of platform, skip dot directories, follow
-    // symlinks (to allow extensions to be linked from elsewhere), and return
-    // the RecursiveDirectoryIterator instance to have access to getSubPath(),
-    // since SplFileInfo does not support relative paths.
-    $flags = \FilesystemIterator::UNIX_PATHS;
-    $flags |= \FilesystemIterator::SKIP_DOTS;
-    $flags |= \FilesystemIterator::FOLLOW_SYMLINKS;
-    $flags |= \FilesystemIterator::CURRENT_AS_SELF;
-    $directory_iterator = new \RecursiveDirectoryIterator($absolute_dir, $flags);
-
-    /**
-     * @var string $key
-     * @var \RecursiveDirectoryIterator $fileinfo
-     */
-    foreach ($directory_iterator as $key => $fileinfo) {
-      if ($this->fileCache && $cached_extension = $this->fileCache->get($fileinfo->getPathname())) {
-        $files[$cached_extension->getType()][$key] = $cached_extension;
-        continue;
-      }
-
-      if (!$fileinfo->isDir()) {
-        continue;
-      }
-
-      $type = self::EXTENSION_TYPE;
-      $name = $fileinfo->getBasename();
-      $pathname = $dir_prefix . $fileinfo->getSubPathname();
-
-      $extension = new Extension($this->root, $type, $pathname);
-
-      // Track the originating directory for sorting purposes.
-      $extension->subpath = self::LIBRARIES_DIRECTORY . '/' . $fileinfo->getFilename();
-      $extension->origin = $dir;
-
-      $files[$type][$key] = $extension;
-
-      if ($this->fileCache) {
-        $this->fileCache->set($fileinfo->getPathname(), $extension);
-      }
-    }
-
-    return $files;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function scan($type, $include_tests = NULL) {
-    return parent::scan(self::EXTENSION_TYPE);
-  }
-
-}
diff --git a/core/lib/Drupal/Core/StreamWrapper/LibraryStream.php b/core/lib/Drupal/Core/StreamWrapper/LibraryStream.php
deleted file mode 100644
index ee6294d..0000000
--- a/core/lib/Drupal/Core/StreamWrapper/LibraryStream.php
+++ /dev/null
@@ -1,84 +0,0 @@
-<?php
-
-namespace Drupal\Core\StreamWrapper;
-
-use Drupal\Core\Extension\LibraryDiscovery;
-
-/**
- * Defines the read-only library:// stream wrapper for library files.
- */
-class LibraryStream extends ExtensionStreamBase {
-
-  /**
-   * The path to the Drupal root.
-   *
-   * @var string
-   */
-  protected $drupalRoot;
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function getOwnerName() {
-    $name = parent::getOwnerName();
-    $library_discovery = new LibraryDiscovery($this->getDrupalRoot());
-    $files = $library_discovery->scan($name);
-    if (!isset($files[$name])) {
-      throw new \RuntimeException("Library $name does not exist");
-    }
-
-    return $name;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function getDirectoryPath() {
-    $name = parent::getOwnerName();
-    $library_discovery = new LibraryDiscovery($this->getDrupalRoot());
-    /** @var $files \Drupal\Core\Extension\Extension[] */
-    $files = $library_discovery->scan($name);
-    $name = $this->getOwnerName();
-    return $files[$name]->getPathname();
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getName() {
-    return $this->t('Library files');
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getDescription() {
-    return $this->t('Local files stored under the libraries directory.');
-  }
-
-  /**
-   * Return the path to the Drupal root.
-   *
-   * Since stream wrappers don't allow us to pass in __construct() parameters,
-   * we have to fall back to \Drupal.
-   *
-   * @return string
-   */
-  protected function getDrupalRoot() {
-    if (!isset($this->drupalRoot)) {
-      $this->drupalRoot = \Drupal::root();
-    }
-    return $this->drupalRoot;
-  }
-
-  /**
-   * Set the path to the Drupal root.
-   *
-   * @param string $drupalRoot
-   *   The absolute path to the root of the Drupal installation.
-   */
-  public function setDrupalRoot($drupalRoot) {
-    $this->drupalRoot = $drupalRoot;
-  }
-
-}
diff --git a/core/modules/system/tests/src/Kernel/File/ExtensionStreamTest.php b/core/modules/system/tests/src/Kernel/File/ExtensionStreamTest.php
index 27d5a41..52d064f 100644
--- a/core/modules/system/tests/src/Kernel/File/ExtensionStreamTest.php
+++ b/core/modules/system/tests/src/Kernel/File/ExtensionStreamTest.php
@@ -32,14 +32,7 @@ class ExtensionStreamTest extends KernelTestBase {
    *
    * @var string[]
    */
-  public static $modules = ['system'];
-
-  /**
-   * The path to the stub library for testing the library wrapper.
-   *
-   * @var string
-   */
-  protected $stubLibraryPath;
+  public static $modules = ['file_module_test', 'system'];
 
   /**
    * {@inheritdoc}
@@ -53,7 +46,7 @@ public function setUp() {
     /** @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface $stream_wrapper_manager */
     $stream_wrapper_manager = $this->container->get('stream_wrapper_manager');
     // Get stream wrapper instances.
-    foreach (['module', 'theme', 'profile', 'library'] as $scheme) {
+    foreach (['module', 'theme', 'profile'] as $scheme) {
       $this->streamWrappers[$scheme] = $stream_wrapper_manager->getViaScheme($scheme);
     }
 
@@ -73,21 +66,6 @@ public function setUp() {
     $theme_installer = $this->container->get('theme_installer');
     // Install Bartik and Seven themes.
     $theme_installer->install(['bartik', 'seven']);
-
-    // Create a stub library for testing.
-    $this->stubLibraryPath = \Drupal::service('site.path') . '/libraries/extension-stream-test';
-    $f = new Filesystem();
-    $f->mkdir([$this->stubLibraryPath, $this->stubLibraryPath . '/subdirectory']);
-    $f->touch([$this->stubLibraryPath . '/empty', $this->stubLibraryPath . '/subdirectory/empty']);
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function tearDown() {
-    parent::tearDown();
-    $f = new Filesystem();
-    $f->remove($this->stubLibraryPath);
   }
 
   /**
@@ -217,16 +195,16 @@ public function providerStreamWrapperMethods() {
         'core/modules/system/css/system.admin.css',
       ],
       [
-        'module://file_test/file_test.dummy.inc',
-        'module://file_test',
-        '/core/modules/file/tests/file_test/file_test.dummy.inc',
-        'core/modules/file/tests/file_test/file_test.dummy.inc',
+        'module://file_module_test/file_module_test.dummy.inc',
+        'module://file_module_test',
+        '/core/modules/file/tests/file_module_test/file_module_test.dummy.inc',
+        'core/modules/file/tests/file_module_test/file_module_test.dummy.inc',
       ],
       [
-        'module://file_test/src/file_test.dummy.inc',
-        'module://file_test/src',
-        '/core/modules/file/tests/file_test/src/file_test.dummy.inc',
-        'core/modules/file/tests/file_test/src/file_test.dummy.inc',
+        'module://file_module_test/src/file_module_test.dummy.inc',
+        'module://file_module_test/src',
+        '/core/modules/file/tests/file_module_test/src/file_module_test.dummy.inc',
+        'core/modules/file/tests/file_module_test/src/file_module_test.dummy.inc',
       ],
       [
         'module://ckeditor/ckeditor.info.yml',
@@ -296,37 +274,6 @@ public function providerStreamWrapperMethods() {
         '/core/profiles/minimal/minimal.info.yml',
         'core/profiles/minimal/minimal.info.yml',
       ],
-      // Cases for library:// stream wrapper.
-      [
-        'library://extension-stream-test',
-        'library://extension-stream-test',
-        '/libraries/extension-stream-test',
-        'libraries/extension-stream-test',
-      ],
-      [
-        'library://extension-stream-test/empty',
-        'library://extension-stream-test',
-        '/libraries/extension-stream-test/empty',
-        'libraries/extension-stream-test/empty',
-      ],
-      [
-        'library://extension-stream-test/subdirectory/empty',
-        'library://extension-stream-test/subdirectory',
-        '/libraries/extension-stream-test/subdirectory/empty',
-        'libraries/extension-stream-test/subdirectory/empty',
-      ],
-      [
-        'library://does-not-exist',
-        new \RuntimeException('Library does-not-exist does not exist'),
-        new \RuntimeException('Library does-not-exist does not exist'),
-        new \RuntimeException('Library does-not-exist does not exist'),
-      ],
-      [
-        'library://does-not-exist/does-not-exist.js',
-        new \RuntimeException('Library does-not-exist does not exist'),
-        new \RuntimeException('Library does-not-exist does not exist'),
-        new \RuntimeException('Library does-not-exist does not exist'),
-      ],
     ];
   }