[AppRemoting] Break out AppRemoting shared module (re-land).

remoting/webapp/app_remoting/js/app_remoting_activity.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
  * Type definition for the RunApplicationResponse returned by the API.
  * @typedef {{
@@ skipping 76 matching lines @@
   this.session_ = null;
 };
 
 /**
  * @param {string} token
  * @return {Promise<!remoting.Xhr.Response>}
  * @private
  */
 remoting.AppRemotingActivity.prototype.getAppHostInfo_ = function(token) {
   var url = remoting.settings.APP_REMOTING_API_BASE_URL + '/applications/' +
-            remoting.settings.getAppRemotingApplicationId() + '/run';
+            this.app_.getApplicationId() + '/run';
   // TODO(kelvinp): Passes |this.subscriptionToken_| to the XHR.
   return new remoting.AutoRetryXhr({
     method: 'POST',
     url: url,
     oauthToken: token
   }).start();
 };
 
 /**
  * @param {!remoting.Xhr.Response} xhrResponse
@@ skipping 153 matching lines @@
  * @private
  */
 remoting.AppRemotingActivity.prototype.showErrorMessage_ = function(error) {
   console.error('Connection failed: ' + error.toString());
   remoting.MessageWindow.showErrorMessage(
       this.app_.getApplicationName(),
       chrome.i18n.getMessage(error.getTag()));
 };
 
 })();