Deletes all states in multiple flows and dequeues all client messages.

def MultiDestroyFlowStates(self, session_ids):
    """Deletes all states in multiple flows and dequeues all client messages."""
    deleted_requests = self.data_store.MultiDestroyFlowStates(
        session_ids, request_limit=self.request_limit)

    for request in deleted_requests:
      if request.HasField("request"):
        # Client request dequeueing is cached so we can call it directly.
        self.DeQueueClientRequest(request.request)