'Unlocks subject using lock id.'

def UnlockSubject(self, subject, transid, token):

    request = rdf_data_store.DataStoreRequest(subject=[subject])
    if token:
        request.token = token
    blob = rdf_protodict.DataBlob(string=transid)
    value = rdf_data_store.DataStoreValue(value=blob)
    request.values.Append(value)
    typ = rdf_data_server.DataStoreCommand.Command.UNLOCK_SUBJECT
    self._MakeSyncRequest(request, typ)
    return transid
