Issue #2301601 by joshi.rohit100: Remove drupal_validate_form() as it is deprecated.

core/includes/form.inc

@@ -263,18 +263,6 @@ function drupal_process_form($form_id, &$form, &$form_state) {
   \Drupal::formBuilder()->processForm($form_id, $form, $form_state);
 }
 
-/**
- * Validates user-submitted form data in the $form_state array.
- *
- * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
- *   Use \Drupal::formBuilder()->validateForm().
- *
- * @see \Drupal\Core\Form\FormValidatorInterface::validateForm().
- */
-function drupal_validate_form($form_id, &$form, &$form_state) {
-  \Drupal::formBuilder()->validateForm($form_id, $form, $form_state);
-}
-
 /**
  * Redirects the user to a URL after a form has been processed.
  *

core/modules/system/tests/modules/form_test/form_test.module

@@ -81,7 +81,7 @@ function system_form_form_test_alter_form_alter(&$form, &$form_state) {
 }
 
 /**
- * Form builder for testing drupal_validate_form().
+ * Form builder for testing \Drupal\Core\Form\FormValidatorInterface::validateForm().
  *
  * Serves for testing form processing and alterations by form validation
  * handlers, especially for the case of a validation error: