doStopObservingMediaSinks_(sourceUrn) {
    this.providers_.forEach(p => {
      p.stopObservingMediaSinks(sourceUrn);
    });
  }
/**
   * Helper method to stop a sink query on all providers.
   * @param {string} sourceUrn The URN of the media.
   * @private
   */
Helper method to stop a sink query on all providers.
@param {string} sourceUrn The URN of the media.
@private
Helper method to stop a sink query on all providers . @param { string } sourceUrn The URN of the media . @private
doStopObservingMediaSinks_(sourceUrn) {
    this.providers_.forEach(p => {
      p.stopObservingMediaSinks(sourceUrn);
    });
  }
doStopObservingMediaSinks_ ( sourceUrn ) { this . providers_ . forEach ( p => { p . stopObservingMediaSinks ( sourceUrn ) ; } ) ; }
Helper method to stop a sink query on all providers.
Helper method to stop a sink query on all providers .