7 files declare their use of ContextAwarePluginInterface in Zircon Profile 8

BlockAccessControlHandler.php in core/modules/block/src/BlockAccessControlHandler.php

Contains \Drupal\block\BlockAccessControlHandler.

BlockForm.php in core/modules/block/src/BlockForm.php

Contains \Drupal\block\BlockForm.

BlockRepositoryTest.php in core/modules/block/tests/src/Unit/BlockRepositoryTest.php

Contains \Drupal\Tests\block\Unit\BlockRepositoryTest.

BlockViewBuilder.php in core/modules/block/src/BlockViewBuilder.php

Contains \Drupal\block\BlockViewBuilder.

ContextHandler.php in core/lib/Drupal/Core/Plugin/Context/ContextHandler.php

Contains \Drupal\Core\Plugin\Context\ContextHandler.

ContextHandlerInterface.php in core/lib/Drupal/Core/Plugin/Context/ContextHandlerInterface.php

Contains \Drupal\Core\Plugin\Context\ContextHandlerInterface.

ContextHandlerTest.php in core/tests/Drupal/Tests/Core/Plugin/ContextHandlerTest.php

Contains \Drupal\Tests\Core\Plugin\ContextHandlerTest.