7 files declare their use of LocalActionDefault in Drupal 8

BlockContentAddLocalAction.php in core/modules/block_content/src/Plugin/Menu/LocalAction/BlockContentAddLocalAction.php

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

MenuLinkAdd.php in core/modules/menu_ui/src/Plugin/Menu/LocalAction/MenuLinkAdd.php

TestLocalAction.php in core/modules/system/tests/modules/menu_test/src/Plugin/Menu/LocalAction/TestLocalAction.php

TestLocalAction4.php in core/modules/system/tests/modules/menu_test/src/Plugin/Menu/LocalAction/TestLocalAction4.php

TestLocalAction5.php in core/modules/system/tests/modules/menu_test/src/Plugin/Menu/LocalAction/TestLocalAction5.php

TestLocalActionWithConfig.php in core/modules/system/tests/modules/menu_test/src/Plugin/Menu/LocalAction/TestLocalActionWithConfig.php