16 files declare their use of MainContentViewSubscriber in Zircon Profile 8

AjaxFormCacheTest.php in core/modules/system/src/Tests/Ajax/AjaxFormCacheTest.php

Contains \Drupal\system\Tests\Ajax\AjaxFormCacheTest.

BlockLibraryController.php in core/modules/block/src/Controller/BlockLibraryController.php

Contains \Drupal\block\Controller\BlockLibraryController.

DialogTest.php in core/modules/system/src/Tests/Ajax/DialogTest.php

Contains \Drupal\system\Tests\Ajax\DialogTest.

DynamicPageCacheIntegrationTest.php in core/modules/dynamic_page_cache/src/Tests/DynamicPageCacheIntegrationTest.php

Contains \Drupal\dynamic_page_cache\Tests\DynamicPageCacheIntegrationTest.

EntityCacheTagsTestBase.php in core/modules/system/src/Tests/Entity/EntityCacheTagsTestBase.php

Contains \Drupal\system\Tests\Entity\EntityCacheTagsTestBase.

FormAjaxSubscriber.php in core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php

Contains \Drupal\Core\Form\EventSubscriber\FormAjaxSubscriber.

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

Contains \Drupal\Core\Form\FormBuilder.

NodeBlockFunctionalTest.php in core/modules/node/src/Tests/NodeBlockFunctionalTest.php

Contains \Drupal\node\Tests\NodeBlockFunctionalTest.

QuickEditIntegrationLoadingTest.php in core/modules/editor/src/Tests/QuickEditIntegrationLoadingTest.php

Contains \Drupal\editor\Tests\QuickEditIntegrationLoadingTest.

QuickEditLoadingTest.php in core/modules/quickedit/src/Tests/QuickEditLoadingTest.php

Contains \Drupal\quickedit\Tests\QuickEditLoadingTest.

RenderWebTest.php in core/modules/system/src/Tests/Common/RenderWebTest.php

Contains \Drupal\system\Tests\Common\RenderWebTest.

RouterTest.php in core/modules/system/src/Tests/Routing/RouterTest.php

Contains \Drupal\system\Tests\Routing\RouterTest.

TokenReplaceWebTest.php in core/modules/system/src/Tests/System/TokenReplaceWebTest.php

Contains \Drupal\system\Tests\System\TokenReplaceWebTest.

ToolbarCacheContextsTest.php in core/modules/toolbar/src/Tests/ToolbarCacheContextsTest.php

Contains \Drupal\toolbar\Tests\ToolbarCacheContextsTest.

TrackerTest.php in core/modules/tracker/src/Tests/TrackerTest.php

Contains \Drupal\tracker\Tests\TrackerTest.

WebTestBase.php in core/modules/simpletest/src/WebTestBase.php

Contains \Drupal\simpletest\WebTestBase.