Form submission handler for the 'Delete' button on path_admin_form().
function path_admin_form_delete_submit($form, &$form_state) {
$destination = array();
$query = Drupal::request()->query;
if ($query
->has('destination')) {
$destination = drupal_get_destination();
$query
->remove('destination');
}
$form_state['redirect'] = array(
'admin/config/search/path/delete/' . $form_state['values']['pid'],
array(
'query' => $destination,
),
);
}