docs: def RemoveClientLabels(self, client_id, owner, labels, cursor=None):
      """Removes a list of user labels from a given client."""
  
      query = ("DELETE FROM client_labels "
               "WHERE client_id = %s AND owner_username_hash = %s "
               "AND label IN ({})").format(", ".join(["%s"] * len(labels)))
      args = [db_utils.ClientIDToInt(client_id), mysql_utils.Hash(owner)] + labels
      cursor.execute(query, args)