20 files declare their use of PluginBase in Zircon Profile 8

AccessPluginBase.php in core/modules/views/src/Plugin/views/access/AccessPluginBase.php

Contains \Drupal\views\Plugin\views\access\AccessPluginBase.

ArgumentDefaultPluginBase.php in core/modules/views/src/Plugin/views/argument_default/ArgumentDefaultPluginBase.php

Contains \Drupal\views\Plugin\views\argument_default\ArgumentDefaultPluginBase.

ArgumentValidatorPluginBase.php in core/modules/views/src/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php

Contains \Drupal\views\Plugin\views\argument_validator\ArgumentValidatorPluginBase.

CachePluginBase.php in core/modules/views/src/Plugin/views/cache/CachePluginBase.php

Contains \Drupal\views\Plugin\views\cache\CachePluginBase.

DisplayExtenderPluginBase.php in core/modules/views/src/Plugin/views/display_extender/DisplayExtenderPluginBase.php

Contains \Drupal\views\Plugin\views\display_extender\DisplayExtenderPluginBase.

DisplayPluginBase.php in core/modules/views/src/Plugin/views/display/DisplayPluginBase.php

Contains \Drupal\views\Plugin\views\display\DisplayPluginBase.

EntityTranslationRenderTrait.php in core/modules/views/src/Entity/Render/EntityTranslationRenderTrait.php

Contains \Drupal\views\Entity\Render\EntityTranslationRenderTrait.

ExposedFormPluginBase.php in core/modules/views/src/Plugin/views/exposed_form/ExposedFormPluginBase.php

Contains \Drupal\views\Plugin\views\exposed_form\ExposedFormPluginBase.

FieldCustomTest.php in core/modules/views/src/Tests/Handler/FieldCustomTest.php

Contains \Drupal\views\Tests\Handler\FieldCustomTest.

LanguageFilter.php in core/modules/views/src/Plugin/views/filter/LanguageFilter.php

Contains \Drupal\views\Plugin\views\filter\LanguageFilter.

NodeLanguageTest.php in core/modules/node/src/Tests/Views/NodeLanguageTest.php

Contains \Drupal\node\Tests\Views\NodeLanguageTest.

PagerPluginBase.php in core/modules/views/src/Plugin/views/pager/PagerPluginBase.php

Contains \Drupal\views\Plugin\views\pager\PagerPluginBase.

PluginBaseTest.php in core/modules/views/src/Tests/Plugin/PluginBaseTest.php

Contains \Drupal\views\Tests\Plugin\PluginBaseTest.

QueryPluginBase.php in core/modules/views/src/Plugin/views/query/QueryPluginBase.php

Contains \Drupal\views\Plugin\views\query\QueryPluginBase.

RowPluginBase.php in core/modules/views/src/Plugin/views/row/RowPluginBase.php

Contains \Drupal\views\Plugin\views\row\RowPluginBase.

StylePluginBase.php in core/modules/views/src/Plugin/views/style/StylePluginBase.php

Contains \Drupal\views\Plugin\views\style\StylePluginBase.

TestHelperPlugin.php in core/modules/views/src/Tests/TestHelperPlugin.php

Contains \Drupal\views\Tests\TestHelperPlugin.

views.api.php in core/modules/views/views.api.php

Describes hooks and plugins provided by the Views module.

views.views_execution.inc in core/modules/views/views.views_execution.inc

Provides views runtime hooks for views.module.

WizardPluginBase.php in core/modules/views/src/Plugin/views/wizard/WizardPluginBase.php

Contains \Drupal\views\Plugin\views\wizard\WizardPluginBase.