/**
* {@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());
}