code: function Download01Org(application, platform, channel) {
  
      this._application = application;
  
      if (Download01Org.PLATFORMS.indexOf(platform) == -1) {
          throw new Error("Unknown platform " + platform);
      }
      this._platform = platform;
  
      if (Download01Org.CHANNELS.indexOf(channel) == -1) {
          throw new Error("Unknown channel " + channel);
      }
      this._channel = channel;
  
      this._flavor = "crosswalk";
  
      this._androidWordSize = "32";
  }
docs: Crosswalk release lookup and download.
  @constructor
  @param {Application} application application instance
  @param {String} platform Crosswalk release platform android/windows
  @param {String} channel Crosswalk channel beta/canary/stable
  @throws {Error} If no valid channel was specified.