Issue #2177031 by dawehner, tim.plunkett, Berdir: Remove menu_get_item() and every use of it. .

core/core.services.yml

core/includes/menu.inc

core/includes/path.inc

core/lib/Drupal/Core/Menu/LocalTaskManager.php

...modules/block/custom_block/custom_block.local_actions.yml

core/modules/block/custom_block/custom_block.module

...ock/Plugin/Menu/LocalAction/CustomBlockAddLocalAction.php

core/modules/book/lib/Drupal/book/BookManager.php

core/modules/node/node.local_actions.yml

core/modules/node/node.module

core/modules/shortcut/shortcut.module

...modules/system/lib/Drupal/system/Form/ModulesListForm.php

core/modules/system/lib/Drupal/system/SystemManager.php

...es/system/lib/Drupal/system/Tests/Menu/LocalTasksTest.php

...em/lib/Drupal/system/Tests/Menu/MenuRouterRebuildTest.php

...es/system/lib/Drupal/system/Tests/Menu/MenuRouterTest.php

core/modules/system/system.api.php

core/modules/system/system.module

core/modules/system/system.services.yml

.../system/tests/modules/menu_test/menu_test.local_tasks.yml