code: @Override
    public Value<Void> run(List<GcsFilename> files) throws Exception {
      for (GcsFilename file : files) {
        try {
          gcs.delete(file);
        } catch (RetriesExhaustedException | IOException e) {
          log.log(Level.WARNING, "Failed to cleanup file: " + file, e);
        }
      }
      return null;
    }
docs: Deletes the files in the provided GoogleCloudStorageFileSet