Fix up remoting UI to make it closer to spec

remoting/webapp/me2mom/oauth2.js

 // Copyright (c) 2011 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.
 
 // Declare an OAuth2 class to handle retrieval/storage of an OAuth2 token.
 //
 // Ideally, this should implement the OAuth2 PostMessage flow to avoid needing
 // to copy and paste a code, but that does not support extension URL schemes
 // quite yet. Instead, we currently use the native app flow with an
 // authorization code that the user must cut/paste.
+
+var remoting = chrome.extension.getBackgroundPage().remoting;
+
 function OAuth2() {
   this.OAUTH2_REFRESH_TOKEN_NAME = 'oauth2_refresh_token';
 
   this.client_id = encodeURIComponent(
       '440925447803-m890isgsr23kdkcu2erd4mirnrjalf98.' +
       'apps.googleusercontent.com');
   this.client_secret = encodeURIComponent('TgKrL73H2kJe6Ir0ufp7bf6e');
   this.scope = encodeURIComponent(
       'https://www.googleapis.com/auth/chromoting ' +
       'https://www.googleapis.com/auth/googletalk');
@@ skipping 108 matching lines @@
   xhr.open('POST', 'https://accounts.google.com/o/oauth2/token', true);
   xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
   var post_data = 'client_id=' + this.client_id
       + '&client_secret=' + this.client_secret
       + '&redirect_uri=' + this.redirect_uri
       + '&code=' + encodeURIComponent(code)
       + '&grant_type=authorization_code';
   xhr.send(post_data);
 }