22 files declare their use of LockBackendInterface in Zircon Profile 8

AliasWhitelist.php in core/lib/Drupal/Core/Path/AliasWhitelist.php

Contains \Drupal\Core\Path\AliasWhitelist.

CacheCollector.php in core/lib/Drupal/Core/Cache/CacheCollector.php

Contains \Drupal\Core\Cache\CacheCollector.

ConfigImporter.php in core/lib/Drupal/Core/Config/ConfigImporter.php

Contains \Drupal\Core\Config\ConfigImporter.

ConfigSingleImportForm.php in core/modules/config/src/Form/ConfigSingleImportForm.php

Contains \Drupal\config\Form\ConfigSingleImportForm.

ConfigSync.php in core/modules/config/src/Form/ConfigSync.php

Contains \Drupal\config\Form\ConfigSync.

Cron.php in core/lib/Drupal/Core/Cron.php

Contains \Drupal\Core\Cron.

ImageStyleDownloadController.php in core/modules/image/src/Controller/ImageStyleDownloadController.php

Contains \Drupal\image\Controller\ImageStyleDownloadController.

LibraryDiscoveryCollector.php in core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php

Contains \Drupal\Core\Asset\LibraryDiscoveryCollector.

LocaleLookup.php in core/modules/locale/src/LocaleLookup.php

Contains \Drupal\locale\LocaleLookup.

LocaleTranslation.php in core/modules/locale/src/LocaleTranslation.php

Contains \Drupal\locale\LocaleTranslation.

MemcacheBackend.php in modules/memcache/src/MemcacheBackend.php

Contains \Drupal\memcache\MemcacheBackend.

MemcacheBackendFactory.php in modules/memcache/src/MemcacheBackendFactory.php

Contains \Drupal\memcache\MemcacheBackendFactory.

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

Contains \Drupal\Core\Menu\MenuActiveTrail.

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

Contains \Drupal\Core\EventSubscriber\MenuRouterRebuildSubscriber.

PrivateTempStore.php in core/modules/user/src/PrivateTempStore.php

Contains \Drupal\user\PrivateTempStore.

PrivateTempStoreFactory.php in core/modules/user/src/PrivateTempStoreFactory.php

Contains \Drupal\user\PrivateTempStoreFactory.

Registry.php in core/lib/Drupal/Core/Theme/Registry.php

Contains \Drupal\Core\Theme\Registry.

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

Contains \Drupal\Core\Routing\RouteBuilder.

SharedTempStore.php in core/modules/user/src/SharedTempStore.php

Contains \Drupal\user\SharedTempStore.

SharedTempStoreFactory.php in core/modules/user/src/SharedTempStoreFactory.php

Contains \Drupal\user\SharedTempStoreFactory.

SystemTestController.php in core/modules/system/tests/modules/system_test/src/Controller/SystemTestController.php

Contains \Drupal\system_test\Controller\SystemTestController.

ThemeRegistry.php in core/lib/Drupal/Core/Utility/ThemeRegistry.php

Contains \Drupal\Core\Utility\ThemeRegistry.