code: @Override
    public List<String> listObjectNames(
        String bucketName, String objectNamePrefix, String delimiter)
        throws IOException {
      return listObjectNames(
          bucketName, objectNamePrefix, delimiter, GoogleCloudStorage.MAX_RESULTS_UNLIMITED);
    }
docs: See {@link GoogleCloudStorage#listObjectNames(String, String, String)}
  for details about expected behavior.