13 files declare their use of RouteSubscriberBase in Drupal 10

AdminRouteSubscriber.php in core/modules/system/src/EventSubscriber/AdminRouteSubscriber.php

ContentModerationRouteSubscriber.php in core/modules/content_moderation/src/Routing/ContentModerationRouteSubscriber.php

ContentTranslationRouteSubscriber.php in core/modules/content_translation/src/Routing/ContentTranslationRouteSubscriber.php

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

NodeAdminRouteSubscriber.php in core/modules/node/src/EventSubscriber/NodeAdminRouteSubscriber.php

RouteSubscriber.php in core/modules/views/src/EventSubscriber/RouteSubscriber.php

RouteSubscriber.php in core/modules/node/src/Routing/RouteSubscriber.php

RouteSubscriber.php in core/modules/media_library/src/Routing/RouteSubscriber.php

RouteSubscriber.php in core/modules/config_translation/src/Routing/RouteSubscriber.php

RouteSubscriber.php in core/modules/field_ui/src/Routing/RouteSubscriber.php

RouteSubscriber.php in core/modules/media/tests/modules/media_test_embed/src/Routing/RouteSubscriber.php

RouteTestSubscriber.php in core/modules/system/tests/modules/router_test_directory/src/RouteTestSubscriber.php

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