code: def Convert(self, metadata, grr_message, token=None):
      
      return self.BatchConvert([(metadata, grr_message)], token=token)
docs: Converts GrrMessage into a set of RDFValues.
  
      Args:
        metadata: ExportedMetadata to be used for conversion.
        grr_message: GrrMessage to be converted.
        token: Security token.
  
      Returns:
        List or generator with resulting RDFValues.