async clearLiveSeekableRange() {
    if (this.destroyer_.destroyed() || this.video_.error ||
        this.usingRemotePlayback_ || this.reloadingMediaSource_) {
      return;
    }
    goog.asserts.assert('clearLiveSeekableRange' in this.mediaSource_,
        'Using clearLiveSeekableRange on not supported platform');
    if (this.ended() || this.closed()) {
      return;
    }
    await this.enqueueBlockingOperation_(() => {
      if (this.ended() || this.closed()) {
        return;
      }
      this.mediaSource_.clearLiveSeekableRange();
    });
  }
Clear the current live seekable range.