Issue #2102479 by InternetDevels, dipen chaudhary: Remove drupal_set_title in...

Issue #2102479 by InternetDevels, dipen chaudhary: Remove drupal_set_title in system/ajax_test module controllers.

core/modules/system/tests/modules/ajax_test/ajax_test.routing.yml

 ajax_test.dialog_contents:
   path: '/ajax-test/dialog-contents'
   defaults:
+    _title: 'AJAX Dialog contents'
     _content: '\Drupal\ajax_test\Controller\AjaxTestController::dialogContents'
   requirements:
     _access: 'TRUE'
@@ -8,6 +9,7 @@ ajax_test.dialog_contents:
 ajax_test.dialog_form:
   path: '/ajax-test/dialog-form'
   defaults:
+    _title: 'Ajax Form contents'
     _form: '\Drupal\ajax_test\AjaxTestForm'
   requirements:
     _access: 'TRUE'

core/modules/system/tests/modules/ajax_test/lib/Drupal/ajax_test/AjaxTestForm.php

@@ -26,8 +26,6 @@ public function getFormId() {
    */
   public function buildForm(array $form, array &$form_state) {
 
-    drupal_set_title(t('Ajax Form contents'));
-
     $form['#action'] = url('ajax-test/dialog');
     $form['#cache'] = TRUE;
 

core/modules/system/tests/modules/ajax_test/lib/Drupal/ajax_test/Controller/AjaxTestController.php

@@ -17,7 +17,6 @@ class AjaxTestController {
    */
   public function dialogContents() {
     // Re-use the utility method that returns the example content.
-    drupal_set_title(t('AJAX Dialog contents'));
     return ajax_test_dialog_contents();
   }