12 files declare their use of ViewUI

Analyze.php in drupal/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/Analyze.php
Contains \Drupal\views_ui\Form\Ajax\Analyze.
EditDetails.php in drupal/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/EditDetails.php
Contains \Drupal\views_ui\Form\Ajax\EditDetails.
RearrangeFilter.php in drupal/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/RearrangeFilter.php
Contains \Drupal\views_ui\Form\Ajax\RearrangeFilter.
ReorderDisplays.php in drupal/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/ReorderDisplays.php
Contains \Drupal\views_ui\Form\Ajax\ReorderDisplays.
View.php in drupal/core/modules/views/lib/Drupal/views/Plugin/Core/Entity/View.php
Definition of Drupal\views\Plugin\Core\Entity\View.
ViewsFormBase.php in drupal/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/ViewsFormBase.php
Contains \Drupal\views_ui\Form\Ajax\ViewsFormBase.
ViewsUIController.php in drupal/core/modules/views_ui/lib/Drupal/views_ui/Controller/ViewsUIController.php
Contains \Drupal\views_ui\Controller\ViewsUIController.
views_ui.module in drupal/core/modules/views_ui/views_ui.module
Provide structure for the administrative interface to Views.
ViewUIConverter.php in drupal/core/modules/views_ui/lib/Drupal/views_ui/ParamConverter/ViewUIConverter.php
Contains \Drupal\views_ui\ParamConverter\ViewUIConverter.
ViewUIObjectTest.php in drupal/core/modules/views_ui/tests/Drupal/views_ui/Tests/ViewUIObjectTest.php
Contains \Drupal\views_ui\Tests\ViewUIObjectTest.
WizardPluginBase.php in drupal/core/modules/views/lib/Drupal/views/Plugin/views/wizard/WizardPluginBase.php
Definition of Drupal\views\Plugin\views\wizard\WizardPluginBase.
WizardPluginBaseUnitTest.php in drupal/core/modules/views/lib/Drupal/views/Tests/Wizard/WizardPluginBaseUnitTest.php
Contains \Drupal\views\Tests\Wizard\WizardPluginBaseUnitTest.