9 files declare their use of ContextException in Zircon Profile 8

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

Contains \Drupal\block\BlockAccessControlHandler.

ConditionAccessResolverTrait.php in core/lib/Drupal/Core/Condition/ConditionAccessResolverTrait.php

Contains \Drupal\Core\Condition\ConditionAccessResolverTrait.

ConditionAccessResolverTraitTest.php in core/tests/Drupal/Tests/Core/Condition/ConditionAccessResolverTraitTest.php

Contains \Drupal\Tests\Core\Condition\ConditionAccessResolverTraitTest.

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

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

Context.php in core/lib/Drupal/Component/Plugin/Context/Context.php

Contains \Drupal\Component\Plugin\Context\Context.

ContextAwarePluginBase.php in core/lib/Drupal/Core/Plugin/ContextAwarePluginBase.php

Contains \Drupal\Core\Plugin\ContextAwarePluginBase.

ContextAwarePluginBase.php in core/lib/Drupal/Component/Plugin/ContextAwarePluginBase.php

Contains \Drupal\Component\Plugin\ContextAwarePluginBase.

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

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

ContextPluginTest.php in core/modules/system/src/Tests/Plugin/ContextPluginTest.php

Contains \Drupal\system\Tests\Plugin\ContextPluginTest.