commit 0d17daef7ab0a60daf1a408d48802dac5e41eb86
Author: Tim Plunkett <git@plnktt.com>
Date:   Wed May 21 15:14:21 2014 -0700

    Stop validating.

diff --git a/core/lib/Drupal/Component/Plugin/ContextAwarePluginBase.php b/core/lib/Drupal/Component/Plugin/ContextAwarePluginBase.php
index e24ea43..f04f07d 100644
--- a/core/lib/Drupal/Component/Plugin/ContextAwarePluginBase.php
+++ b/core/lib/Drupal/Component/Plugin/ContextAwarePluginBase.php
@@ -130,12 +130,6 @@ public function setContextValue($name, $value) {
     $context_definition = $this->getContextDefinition($name);
     $this->context[$name] = new Context($context_definition);
     $this->context[$name]->setContextValue($value);
-
-    // Verify the provided value validates.
-    $violations = $this->context[$name]->validate();
-    if (count($violations) > 0) {
-      throw new PluginException("The provided context value does not pass validation.");
-    }
     return $this;
   }
 
diff --git a/core/lib/Drupal/Core/Plugin/ContextAwarePluginBase.php b/core/lib/Drupal/Core/Plugin/ContextAwarePluginBase.php
index 19f5825..d369bcc 100644
--- a/core/lib/Drupal/Core/Plugin/ContextAwarePluginBase.php
+++ b/core/lib/Drupal/Core/Plugin/ContextAwarePluginBase.php
@@ -8,7 +8,6 @@
 namespace Drupal\Core\Plugin;
 
 use Drupal\Component\Plugin\ContextAwarePluginBase as ComponentContextAwarePluginBase;
-use Drupal\Component\Plugin\Exception\PluginException;
 use Drupal\Core\Plugin\Context\Context;
 use Drupal\Component\Plugin\Discovery\DiscoveryInterface;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
@@ -48,11 +47,6 @@ public function setContextValue($name, $value) {
     // Use the Drupal specific context class.
     $this->context[$name] = new Context($context_definition);
     $this->context[$name]->setContextValue($value);
-
-    // Verify the provided value validates.
-    if ($this->context[$name]->validate()->count() > 0) {
-      throw new PluginException("The provided context value does not pass validation.");
-    }
     return $this;
   }