code: public void destroyNotification(BaseDownloadTask task) {
          if (disableNotification(task)) {
              return;
          }
  
          this.helper.showIndeterminate(task.getId(), task.getStatus());
  
          final BaseNotificationItem n = this.helper.
                  remove(task.getId());
          if (!interceptCancel(task, n) && n != null) {
              n.cancel();
          }
      }
docs: The notification item with the {@code task} is told to destroy.
  
  @param task The task used to identify the will be destroyed notification item.