7 files declare their use of ContextAwarePluginInterface

BlockAccessControlHandler.php in core/modules/block/src/BlockAccessControlHandler.php
BlockForm.php in core/modules/block/src/BlockForm.php
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
ContextHandler.php in core/lib/Drupal/Core/Plugin/Context/ContextHandler.php
ContextHandlerInterface.php in core/lib/Drupal/Core/Plugin/Context/ContextHandlerInterface.php
ContextHandlerTest.php in core/tests/Drupal/Tests/Core/Plugin/ContextHandlerTest.php
Contains \Drupal\Tests\Core\Plugin\ContextHandlerTest.

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