Issue #2352641 by chx, alexpott: Break router.builder dependency.

core/core.services.yml

core/lib/Drupal/Core/Extension/ModuleHandler.php

core/lib/Drupal/Core/Extension/ThemeHandler.php

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

core/lib/Drupal/Core/Routing/RouteBuilderIndicator.php

...ib/Drupal/Core/Routing/RouteBuilderIndicatorInterface.php

core/lib/Drupal/Core/Routing/RouteBuilderInterface.php

...modules/content_translation/content_translation.admin.inc

core/modules/content_translation/content_translation.module

core/modules/field_ui/field_ui.module

core/modules/menu_ui/menu_ui.install

core/modules/node/node.module

core/modules/search/src/Entity/SearchPage.php

core/modules/system/entity.api.php

core/modules/system/src/Controller/ThemeController.php

core/modules/user/user.module

core/modules/views/src/Entity/View.php

core/modules/views/views.module

core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php

core/tests/Drupal/Tests/Core/Routing/RouteBuilderTest.php