diff --git a/core/lib/Drupal/Component/Plugin/Mapper/MapperInterface.php b/core/lib/Drupal/Component/Plugin/Mapper/MapperInterface.php
deleted file mode 100644
index 67f091d..0000000
--- a/core/lib/Drupal/Component/Plugin/Mapper/MapperInterface.php
+++ /dev/null
@@ -1,34 +0,0 @@
-<?php
-/**
- * @file
- * Contains \Drupal\Component\Plugin\Mapper\MapperInterface.
- */
-
-namespace Drupal\Component\Plugin\Mapper;
-
-/**
- * Plugin mapper interface.
- *
- * Plugin mappers are responsible for mapping a plugin request to its
- * implementation. For example, it might map a cache bin to a memcache bin.
- *
- * Mapper objects incorporate the best practices of retrieving configurations,
- * type information, and factory instantiation.
- */
-interface MapperInterface {
-
-  /**
-   * Gets a preconfigured instance of a plugin.
-   *
-   * @param array $options
-   *   An array of options that can be used to determine a suitable plugin to
-   *   instantiate and how to configure it.
-   *
-   * @return object|false
-   *   A fully configured plugin instance. The interface of the plugin instance
-   *   will depends on the plugin type. If no instance can be retrieved, FALSE
-   *   will be returned.
-   */
-  public function getInstance(array $options);
-
-}
diff --git a/core/modules/rest/src/Plugin/Type/ResourcePluginManagerInterface.php b/core/modules/rest/src/Plugin/Type/ResourcePluginManagerInterface.php
index e90e9d6..3570362 100644
--- a/core/modules/rest/src/Plugin/Type/ResourcePluginManagerInterface.php
+++ b/core/modules/rest/src/Plugin/Type/ResourcePluginManagerInterface.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\rest\Plugin\Type\ResourcePluginManagerInterface.
+ * Contains \Drupal\rest\Plugin\Type\ResourcePluginManagerInterface.
  */
 
 namespace Drupal\rest\Plugin\Type;