17 files declare their use of AjaxResponse

ajax.inc in drupal/core/modules/views/includes/ajax.inc
Handles the server side AJAX interactions of Views.
AjaxController.php in drupal/core/lib/Drupal/Core/Controller/AjaxController.php
Contains \Drupal\Core\Controller\AjaxController.
ajax_forms_test.module in drupal/core/modules/system/tests/modules/ajax_forms_test/ajax_forms_test.module
Simpletest mock module for Ajax forms testing.
ajax_test.module in drupal/core/modules/system/tests/modules/ajax_test/ajax_test.module
Helper module for Ajax framework tests.
Callbacks.php in drupal/core/modules/system/tests/modules/ajax_forms_test/lib/Drupal/ajax_forms_test/Callbacks.php
Definition of Drupal\ajax_forms_test\Callbacks.
config.admin.inc in drupal/core/modules/config/config.admin.inc
Admin page callbacks for the config module.
ConfigController.php in drupal/core/modules/config/lib/Drupal/config/Controller/ConfigController.php
Contains \Drupal\config\Controller\ConfigController
DialogController.php in drupal/core/lib/Drupal/Core/Controller/DialogController.php
Contains \Drupal\Core\Controller\DialogController.
EditController.php in drupal/core/modules/edit/lib/Drupal/edit/EditController.php
Contains of \Drupal\edit\EditController.
EditorController.php in drupal/core/modules/editor/lib/Drupal/editor/EditorController.php
Contains \Drupal\editor\EditorController.
file.module in drupal/core/modules/file/file.module
Defines a "managed_file" Form API field and a "file" field for Field module.
system.admin.inc in drupal/core/modules/system/system.admin.inc
Admin page callbacks for the system module.
ViewAjaxResponse.php in drupal/core/modules/views/lib/Drupal/views/Ajax/ViewAjaxResponse.php
Contains \Drupal\views\Ajax\ViewAjaxResponse.
ViewEditFormController.php in drupal/core/modules/views_ui/lib/Drupal/views_ui/ViewEditFormController.php
Contains Drupal\views_ui\ViewEditFormController.
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.