/**
  * {@inheritdoc}
  */
 public function submitForm(array &$form, FormStateInterface $form_state)
 {
     $this->page->removeVariant($this->displayVariant->id());
     $this->page->save();
     drupal_set_message($this->t('The display variant %name has been removed.', ['%name' => $this->displayVariant->label()]));
     $form_state->setRedirectUrl($this->getCancelUrl());
 }