15 files declare their use of ContentEntityStorageInterface

CommentStorageInterface.php in core/modules/comment/src/CommentStorageInterface.php
EntityContextDefinition.php in core/lib/Drupal/Core/Plugin/Context/EntityContextDefinition.php
EntityContextDefinitionIsSatisfiedTest.php in core/tests/Drupal/Tests/Core/Plugin/Context/EntityContextDefinitionIsSatisfiedTest.php
EntityConverterTest.php in core/tests/Drupal/Tests/Core/ParamConverter/EntityConverterTest.php
EntityReferenceItem.php in core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
FeedStorageInterface.php in core/modules/aggregator/src/FeedStorageInterface.php
FileStorageInterface.php in core/modules/file/src/FileStorageInterface.php
ItemStorageInterface.php in core/modules/aggregator/src/ItemStorageInterface.php
KeyValueContentEntityStorage.php in core/lib/Drupal/Core/Entity/KeyValueStore/KeyValueContentEntityStorage.php
LayoutBuilderSampleEntityGenerator.php in core/modules/layout_builder/src/Entity/LayoutBuilderSampleEntityGenerator.php
MediaFilterController.php in core/modules/media/src/Controller/MediaFilterController.php
MenuLinkContentStorageInterface.php in core/modules/menu_link_content/src/MenuLinkContentStorageInterface.php
NodeStorageInterface.php in core/modules/node/src/NodeStorageInterface.php
TermStorageInterface.php in core/modules/taxonomy/src/TermStorageInterface.php
UserStorageInterface.php in core/modules/user/src/UserStorageInterface.php

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