Process menu delete form submissions.
function menu_item_delete_form_submit($form, &$form_state) {
$item = $form['#item'];
menu_link_delete($item['mlid']);
$t_args = array(
'%title' => $item['link_title'],
);
drupal_set_message(t('The menu link %title has been deleted.', $t_args));
watchdog('menu', 'Deleted menu link %title.', $t_args, WATCHDOG_NOTICE);
$form_state['redirect'] = 'admin/structure/menu/manage/' . $item['menu_name'];
}