17 files declare their use of Config

config.inc in drupal/core/includes/config.inc: This is the API for configuration storage.
ConfigContext.php in drupal/core/lib/Drupal/Core/Config/Context/ConfigContext.php: Contains \Drupal\Core\Config\Context\ConfigContext.
ConfigContextFactory.php in drupal/core/lib/Drupal/Core/Config/Context/ConfigContextFactory.php: Contains \Drupal\Core\Config\Context\ConfigContextFactory.
ConfigGlobalOverrideSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/ConfigGlobalOverrideSubscriber.php: Contains \Drupal\Core\EventSubscriber\ConfigGlobalOverrideSubscriber.
ConfigImportSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/ConfigImportSubscriber.php: Contains \Drupal\Core\EventSubscriber\ConfigImportSubscriber.
ConfigSnapshotSubscriber.php in drupal/core/lib/Drupal/Core/EventSubscriber/ConfigSnapshotSubscriber.php: Contains \Drupal\Core\EventSubscriber\ConfigSnapshotSubscriber.
ConfigStorageController.php in drupal/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php: Definition of Drupal\Core\Config\Entity\ConfigStorageController.
ConfigTestStorageController.php in drupal/core/modules/config/tests/config_test/lib/Drupal/config_test/ConfigTestStorageController.php: Contains \Drupal\config_test\ConfigTestStorageController.
ContextInterface.php in drupal/core/lib/Drupal/Core/Config/Context/ContextInterface.php: Contains \Drupal\Core\Config\Context\ContextInterface.
FieldInstanceStorageController.php in drupal/core/modules/field/lib/Drupal/field/FieldInstanceStorageController.php: Contains \Drupal\field\FieldInstanceStorageController.
FieldStorageController.php in drupal/core/modules/field/lib/Drupal/field/FieldStorageController.php: Contains \Drupal\field\FieldStorageController.
ImageStyleStorageController.php in drupal/core/modules/image/lib/Drupal/image/ImageStyleStorageController.php: Contains \Drupal\image\ImageStyleStorageController.
LocaleConfigSubscriber.php in drupal/core/modules/locale/lib/Drupal/locale/LocaleConfigSubscriber.php: Contains \Drupal\locale\LocaleConfigSubscriber.
SearchSettingsForm.php in drupal/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php: Contains \Drupal\search\Form\SearchSettingsForm.
SystemConfigSubscriber.php in drupal/core/modules/system/lib/Drupal/system/SystemConfigSubscriber.php: Contains \Drupal\system\SystemConfigSubscriber.
theme.inc in drupal/core/includes/theme.inc: The theme system, which controls the output of Drupal.
ThemeController.php in drupal/core/modules/system/lib/Drupal/system/Controller/ThemeController.php: Contains \Drupal\system\Controller\ThemeController.