Closure compiler: Add app_remoting_webapp to bot. Fix some errors.

remoting/webapp/app_remoting/js/ar_background.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.
 
 /** @type {chrome.app.window.AppWindow} */
 var mainWindow = null;
 
 /**
  * The main window cannot delete its context menu entries on close because it
  * is being torn down at that point and doesn't have access to the necessary
  * APIs. Instead, it notifies the background page of the entries it creates,
  * and the background pages deletes them when the window is closed.
  *
  * @type {!Object}
  */
 var contextMenuIds = {};
 
-/** @param {chrome.app.runtime.LaunchData=} opt_launchData */
+/** @param {Object=} opt_launchData */
 function createWindow(opt_launchData) {
   // If there is already a window, give it focus.
   if (mainWindow) {
     mainWindow.focus();
     return;
   }
 
   var typed_screen = /** @type {{availWidth: number, availHeight: number}} */
       (screen);
 
@@ skipping 41 matching lines @@
       contextMenuIds[id] = true;
       break;
     case 'removeContextMenuId':
       delete contextMenuIds[id];
       break;
   }
 };
 
 chrome.app.runtime.onLaunched.addListener(createWindow);
 window.addEventListener('message', onWindowMessage, false);