/**
  * Delete ACL entries
  * 
  * @param MutableAclInterface  $acl
  * @param array                $delete
  */
 protected function deleteAclEntries(MutableAclInterface $acl, array $delete)
 {
     foreach (array_reverse($delete, true) as $index => $entry) {
         $acl->deleteObjectAce($index);
     }
 }