8 files declare their use of MediaLibraryState in Drupal 8

DrupalMediaLibrary.php in core/modules/media_library/src/Plugin/CKEditorPlugin/DrupalMediaLibrary.php

MediaLibraryAccessTest.php in core/modules/media_library/tests/src/Kernel/MediaLibraryAccessTest.php

MediaLibraryAddFormTest.php in core/modules/media_library/tests/src/Kernel/MediaLibraryAddFormTest.php

MediaLibrarySelectForm.php in core/modules/media_library/src/Plugin/views/field/MediaLibrarySelectForm.php

MediaLibraryStateTest.php in core/modules/media_library/tests/src/Kernel/MediaLibraryStateTest.php

MediaLibraryWidget.php in core/modules/media_library/src/Plugin/Field/FieldWidget/MediaLibraryWidget.php

media_library.module in core/modules/media_library/media_library.module

Contains hook implementations for the media_library module.

WidgetAccessTest.php in core/modules/media_library/tests/src/FunctionalJavascript/WidgetAccessTest.php