11 files declare their use of ResponsePolicyInterface

ChainResponsePolicyTest.php in core/tests/Drupal/Tests/Core/PageCache/ChainResponsePolicyTest.php
DenyAdminRoutes.php in core/modules/dynamic_page_cache/src/PageCache/ResponsePolicy/DenyAdminRoutes.php
DenyNoCacheRoutes.php in core/lib/Drupal/Core/PageCache/ResponsePolicy/DenyNoCacheRoutes.php
DenyNoCacheRoutesTest.php in core/tests/Drupal/Tests/Core/PageCache/DenyNoCacheRoutesTest.php
DynamicPageCacheSubscriber.php in core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php
FinishResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
FinishResponseSubscriberTest.php in core/tests/Drupal/Tests/Core/EventSubscriber/FinishResponseSubscriberTest.php
KillSwitch.php in core/lib/Drupal/Core/PageCache/ResponsePolicy/KillSwitch.php
NoServerError.php in core/lib/Drupal/Core/PageCache/ResponsePolicy/NoServerError.php
PageCache.php in core/modules/page_cache/src/StackMiddleware/PageCache.php
PageCacheLegacyTest.php in core/modules/page_cache/tests/src/Unit/PageCacheLegacyTest.php

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