9 files declare their use of DerivativeDiscoveryDecorator

BlockManager.php in drupal/core/modules/block/lib/Drupal/block/Plugin/Type/BlockManager.php
ConditionManager.php in drupal/core/lib/Drupal/Core/Condition/ConditionManager.php
Contains \Drupal\Core\Condition\ConditionManager.
ConstraintManager.php in drupal/core/lib/Drupal/Core/Validation/ConstraintManager.php
Contains \Drupal\Core\Validation\ConstraintManager.
LayoutManager.php in drupal/core/modules/layout/lib/Drupal/layout/Plugin/Type/LayoutManager.php
Definition of Drupal\layout\Plugin\Type\LayoutManager.
MockBlockManager.php in drupal/core/modules/system/tests/modules/plugin_test/lib/Drupal/plugin_test/Plugin/MockBlockManager.php
Definition of Drupal\plugin_test\Plugin\MockBlockManager.
PluginUIManager.php in drupal/core/modules/system/lib/Drupal/system/Plugin/Type/PluginUIManager.php
Contains \Drupal\system\Plugin\Type\PluginUIManager.
ResourcePluginManager.php in drupal/core/modules/rest/lib/Drupal/rest/Plugin/Type/ResourcePluginManager.php
Definition of Drupal\rest\Plugin\Type\ResourcePluginManager.
TestPluginManager.php in drupal/core/modules/system/tests/modules/plugin_test/lib/Drupal/plugin_test/Plugin/TestPluginManager.php
Definition of Drupal\plugin_test\Plugin\TestPluginManager.
ViewsPluginManager.php in drupal/core/modules/views/lib/Drupal/views/Plugin/ViewsPluginManager.php
Contains \Drupal\views\Plugin\ViewsPluginManager.