reverted:
--- b/core/lib/Drupal/Core/Entity/ContentEntityStorageInterface.php
+++ a/core/lib/Drupal/Core/Entity/ContentEntityStorageInterface.php
@@ -23,15 +23,4 @@
    */
   public function createTranslation(ContentEntityInterface $entity, $langcode, array $values = []);
 
-  /**
-   * Counts the number of revisions in the default language.
-   *
-   * @param \Drupal\Core\Entity\EntityInterface $entity
-   *   The entity for which to to count the revisions.
-   *
-   * @return int
-   *   The number of revisions in the default language.
-   */
-  public function countDefaultLanguageRevisions(EntityInterface $entity);
-
 }
diff -u b/core/modules/media/tests/src/Functional/MediaRevisionTest.php b/core/modules/media/tests/src/Functional/MediaRevisionTest.php
--- b/core/modules/media/tests/src/Functional/MediaRevisionTest.php
+++ b/core/modules/media/tests/src/Functional/MediaRevisionTest.php
@@ -159,7 +159,7 @@
     $this->drupalGet("media/" . $media->id() . "/revisions/" . $media->getRevisionId() . "/view");
     $assert->pageTextContains('Foobaz');
   }
-  
+
   /**
    * Creates a new revision for a given media item.
    *
only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Entity/Sql/SqlEntityStorageInterface.php
+++ b/core/lib/Drupal/Core/Entity/Sql/SqlEntityStorageInterface.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Core\Entity\Sql;
 
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityStorageInterface;
 
 /**
@@ -21,4 +22,15 @@
    */
   public function getTableMapping(array $storage_definitions = NULL);
 
+  /**
+   * Counts the number of revisions in the default language.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity for which to to count the revisions.
+   *
+   * @return int
+   *   The number of revisions in the default language.
+   */
+  public function countDefaultLanguageRevisions(EntityInterface $entity);
+
 }