code: void finishDownload(OfflineDownloadOptions offlineDownload, OfflineRegion offlineRegion) {
      OfflineDownloadStateReceiver.dispatchSuccessBroadcast(this, offlineDownload);
      offlineRegion.setDownloadState(OfflineRegion.STATE_INACTIVE);
      offlineRegion.setObserver(null);
      removeOfflineRegion(offlineDownload.uuid().intValue());
    }
docs: When a particular download has been completed, this method's called which handles removing the
  notification and setting the download state.
  
  @param offlineRegion   the region which has finished being downloaded
  @param offlineDownload the corresponding options used to define the offline region
  @since 0.1.0