diff --git a/core/lib/Drupal/Core/Block/BlockManager.php b/core/lib/Drupal/Core/Block/BlockManager.php
index 6e0d234..30b52b6 100644
--- a/core/lib/Drupal/Core/Block/BlockManager.php
+++ b/core/lib/Drupal/Core/Block/BlockManager.php
@@ -20,7 +20,6 @@ class BlockManager extends DefaultPluginManager implements BlockManagerInterface
 
   use CategorizingPluginManagerTrait {
     getSortedDefinitions as traitGetSortedDefinitions;
-    getGroupedDefinitions as traitGetGroupedDefinitions;
   }
   use ContextAwarePluginManagerTrait;
 
@@ -54,7 +53,7 @@ public function processDefinition(&$definition, $plugin_id) {
    * {@inheritdoc}
    */
   public function getSortedDefinitions(array $definitions = NULL) {
-    // Sort the plugins first by category, then by label.
+    // Sort the plugins first by category, then by admin label.
     $definitions = $this->traitGetSortedDefinitions($definitions, 'admin_label');
     // Do not display the 'broken' plugin in the UI.
     unset($definitions['broken']);
@@ -64,13 +63,6 @@ public function getSortedDefinitions(array $definitions = NULL) {
   /**
    * {@inheritdoc}
    */
-  public function getGroupedDefinitions(array $definitions = NULL) {
-    return $this->traitGetGroupedDefinitions($definitions, 'admin_label');
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function getFallbackPluginId($plugin_id, array $configuration = []) {
     return 'broken';
   }