Issue #2448339 by a_thakur, gaurav_varshney, Mile23: Remove drupal_form_submit() from form.inc

use Drupal\Core\Url;

use Symfony\Component\HttpFoundation\RedirectResponse;

/**

 * Retrieves, populates, and processes a form.

 *

 * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.

 *   Use \Drupal::formBuilder()->submitForm().

 *

 * @see \Drupal\Core\Form\FormBuilderInterface::submitForm().

 */

function drupal_form_submit($form_arg, FormStateInterface $form_state) {

  \Drupal::formBuilder()->submitForm($form_arg, $form_state);

}

/**

 * Prepares variables for select element templates.

 *