Deprecate most of gaia_auth extension

chrome/browser/resources/gaia_auth_host/post_message_channel.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.
 
 /**
  * @fileoverview
  * Provides a HTML5 postMessage channel to the injected JS to talk back
  * to Authenticator.
  */
 'use strict';
 
-// <include src="../gaia_auth/channel.js">
+// <include src="channel.js">
 
 var PostMessageChannel = (function() {
   /**
    * Allowed origins of the hosting page.
    * @type {Array<string>}
    */
   var ALLOWED_ORIGINS = [
     'chrome://oobe',
     'chrome://chrome-signin'
   ];
@@ skipping 341 matching lines @@
     channelManager.onConnect.addListener(onConnect);
   };
 
   return PostMessageChannel;
 })();
 
 /** @override */
 Channel.create = function() {
   return new PostMessageChannel();
 };