16 files declare their use of AccessManagerInterface in Drupal 8

AccessAwareRouter.php in core/lib/Drupal/Core/Routing/AccessAwareRouter.php

ConfigTranslationController.php in core/modules/config_translation/src/Controller/ConfigTranslationController.php

ContextualLinkManager.php in core/lib/Drupal/Core/Menu/ContextualLinkManager.php

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

DefaultMenuLinkTreeManipulators.php in core/lib/Drupal/Core/Menu/DefaultMenuLinkTreeManipulators.php

LinkBase.php in core/modules/views/src/Plugin/views/field/LinkBase.php

ListingEmpty.php in core/modules/node/src/Plugin/views/area/ListingEmpty.php

ListingEmpty.php in core/modules/block_content/src/Plugin/views/area/ListingEmpty.php

LocalActionManager.php in core/lib/Drupal/Core/Menu/LocalActionManager.php

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

Contains \Drupal\Tests\Core\Menu\LocalActionManagerTest.

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

MenuLinkContentAccessControlHandler.php in core/modules/menu_link_content/src/MenuLinkContentAccessControlHandler.php

MenuLinkContentEntityAccessTest.php in core/modules/menu_link_content/tests/src/Unit/MenuLinkContentEntityAccessTest.php

ModulesListForm.php in core/modules/system/src/Form/ModulesListForm.php

PathBasedBreadcrumbBuilder.php in core/modules/system/src/PathBasedBreadcrumbBuilder.php

UrlTest.php in core/tests/Drupal/Tests/Core/UrlTest.php

Contains \Drupal\Tests\Core\UrlTest.