10 files declare their use of MenuLinkManagerInterface in Drupal 9

MenuDeleteForm.php in core/modules/menu_ui/src/Form/MenuDeleteForm.php

MenuForm.php in core/modules/menu_ui/src/MenuForm.php

MenuLinkContentDeriver.php in core/modules/menu_link_content/src/Plugin/Deriver/MenuLinkContentDeriver.php

MenuLinkDefaultForm.php in core/lib/Drupal/Core/Menu/Form/MenuLinkDefaultForm.php

MenuLinkDefaultFormTest.php in core/tests/Drupal/Tests/Core/Menu/MenuLinkDefaultFormTest.php

MenuLinkParent.php in core/modules/migrate/src/Plugin/migrate/process/MenuLinkParent.php

MenuLinkParentTest.php in core/modules/migrate/tests/src/Unit/process/MenuLinkParentTest.php

MenuLinkPluginConverter.php in core/lib/Drupal/Core/ParamConverter/MenuLinkPluginConverter.php

MenuLinkResetForm.php in core/modules/menu_ui/src/Form/MenuLinkResetForm.php

MenuRouterRebuildSubscriber.php in core/lib/Drupal/Core/EventSubscriber/MenuRouterRebuildSubscriber.php