code: func (c *Client) DeleteJob(j *Job) error {
  	var mr multipartRequest
  	mr.init()
  	mr.WriteField("jobid", j.ID)
  	mr.WriteField("printerid", j.PrinterID)
  	err := jsonRPC(&c.auth, "POST", cloudprintURL+"/deletejob", &mr, nil)
  	if err != nil {
  		return fmt.Errorf("DeleteJob: %v", err)
  	}
  	return nil
  }
docs: // DeleteJob deletes the given print job.