13 files declare their use of RequestPolicyInterface in Zircon Profile 8

AllowToolbarPath.php in core/modules/toolbar/src/PageCache/AllowToolbarPath.php

Contains \Drupal\toolbar\PageCache\AllowToolbarPath.

AllowToolbarPathTest.php in core/modules/toolbar/tests/src/Unit/PageCache/AllowToolbarPathTest.php

Contains \Drupal\Tests\toolbar\Unit\PageCache\AllowToolbarPathTest.

ChainRequestPolicyTest.php in core/tests/Drupal/Tests/Core/PageCache/ChainRequestPolicyTest.php

Contains \Drupal\Tests\Core\PageCache\ChainRequestPolicyTest.

CommandLineOrUnsafeMethod.php in core/lib/Drupal/Core/PageCache/RequestPolicy/CommandLineOrUnsafeMethod.php

Contains \Drupal\Core\PageCache\RequestPolicy\CommandLineOrUnsafeMethod.

CommandLineOrUnsafeMethodTest.php in core/tests/Drupal/Tests/Core/PageCache/CommandLineOrUnsafeMethodTest.php

Contains \Drupal\Tests\Core\PageCache\CommandLineOrUnsafeMethodTest.

DisallowBasicAuthRequests.php in core/modules/basic_auth/src/PageCache/DisallowBasicAuthRequests.php

Contains \Drupal\basic_auth\PageCache\DisallowBasicAuthRequests.

DynamicPageCacheSubscriber.php in core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php

Contains \Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber.

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

Contains \Drupal\Core\EventSubscriber\FinishResponseSubscriber.

FormCache.php in core/lib/Drupal/Core/Form/FormCache.php

Contains \Drupal\Core\Form\FormCache.

NoSessionOpen.php in core/lib/Drupal/Core/PageCache/RequestPolicy/NoSessionOpen.php

Contains \Drupal\Core\PageCache\RequestPolicy\NoSessionOpen.

NoSessionOpenTest.php in core/tests/Drupal/Tests/Core/PageCache/NoSessionOpenTest.php

Contains \Drupal\Tests\Core\PageCache\NoSessionOpenTest.

PageCache.php in core/modules/page_cache/src/StackMiddleware/PageCache.php

Contains \Drupal\page_cache\StackMiddleware\PageCache.

system.module in core/modules/system/system.module

Configuration system that lets administrators modify the workings of the site.