10 files declare their use of DefaultFactory

DefaultsTestPluginManager.php in drupal/core/modules/system/tests/modules/plugin_test/lib/Drupal/plugin_test/Plugin/DefaultsTestPluginManager.php
Contains Drupal\plugin_test\Plugin\DefaultsTestPluginManager.
EntityManager.php in drupal/core/lib/Drupal/Core/Entity/EntityManager.php
Contains \Drupal\Core\Entity\EntityManager.
FetcherManager.php in drupal/core/modules/aggregator/lib/Drupal/aggregator/Plugin/FetcherManager.php
Definition of Drupal\aggregator\Plugin\FetcherManager.
FormatterFactory.php in drupal/core/modules/field/lib/Drupal/field/Plugin/Type/Formatter/FormatterFactory.php
Definition of Drupal\field\Plugin\Type\Formatter\FormatterFactory.
JoinManager.php in drupal/core/modules/views/lib/Drupal/views/Plugin/Type/JoinManager.php
Definition of Drupal\views\Plugin\Type\JoinManager.
PluginManager.php in drupal/core/modules/views/lib/Drupal/views/Plugin/Type/PluginManager.php
Definition of Drupal\views\Plugin\Type\PluginManager.
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.
TypedDataFactory.php in drupal/core/lib/Drupal/Core/TypedData/TypedDataFactory.php
Definition of Drupal\Core\TypedData\TypedDataFactory.
WidgetFactory.php in drupal/core/modules/field/lib/Drupal/field/Plugin/Type/Widget/WidgetFactory.php
Definition of Drupal\field\Plugin\WidgetFactory.
WizardManager.php in drupal/core/modules/views/lib/Drupal/views/Plugin/Type/WizardManager.php
Definition of Drupal\views\Plugin\Type\WizardManager.