[Webapp Refactor] Remove remoting.clientSession.

remoting/webapp/app_remoting/js/app_remoting.js

 // Copyright 2014 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.
 
 /**
  * @fileoverview
  * This class implements the functionality that is specific to application
  * remoting ("AppRemoting" or AR).
  */
 
@@ skipping 20 matching lines @@
 
 /**
  * @return {string} Application product name to be used in UI.
  * @override {remoting.ApplicationInterface}
  */
 remoting.AppRemoting.prototype.getApplicationName = function() {
   var manifest = chrome.runtime.getManifest();
   return manifest.name;
 };
 
+remoting.AppRemoting.prototype.getActivity = function() {
+  return this.activity_;
+};
+
 /**
  * @param {!remoting.Error} error The failure reason.
  * @override {remoting.ApplicationInterface}
  */
 remoting.AppRemoting.prototype.signInFailed_ = function(error) {
   remoting.MessageWindow.showErrorMessage(
       chrome.i18n.getMessage(/*i18n-content*/'CONNECTION_FAILED'),
       chrome.i18n.getMessage(error.getTag()));
 };
 
@@ skipping 14 matching lines @@
   this.activity_.start();
 };
 
 /**
  * @override {remoting.ApplicationInterface}
  */
 remoting.AppRemoting.prototype.exitApplication_ = function() {
   this.activity_.dispose();
   this.closeMainWindow_();
 };