6 files declare their use of EntityChangedTrait in Drupal 8

Comment.php in core/modules/comment/src/Entity/Comment.php

EntityTestConstraints.php in core/modules/system/tests/modules/entity_test/src/Entity/EntityTestConstraints.php

EntityTestMulChanged.php in core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php

File.php in core/modules/file/src/Entity/File.php

User.php in core/modules/user/src/Entity/User.php

Workspace.php in core/modules/workspaces/src/Entity/Workspace.php