Fix some JS style nits.

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">
 
 var PostMessageChannel = (function() {
   /**
    * Allowed origins of the hosting page.
-   * @type {Array.<string>}
+   * @type {Array<string>}
    */
   var ALLOWED_ORIGINS = [
     'chrome://oobe',
     'chrome://chrome-signin'
   ];
 
   /** @const */
   var PORT_MESSAGE = 'post-message-port-message';
 
   /** @const */
@@ skipping 43 matching lines @@
     /**
      * Window and origin to forward message up the hierarchy. For subframes,
      * they defaults to window.parent and any origin. For top level window,
      * this would be set to the hosting webview on CHANNEL_INIT_MESSAGE.
      */
     this.upperWindow = isTopLevel() ? null : window.parent;
     this.upperOrigin = isTopLevel() ? '' : '*';
 
     /**
      * Channle Id to port map.
-     * @type {Object.<number, PostMessagePort>}
+     * @type {Object<number, PostMessagePort>}
      */
     this.channels_ = {};
 
     /**
      * Deferred messages to be posted to |upperWindow|.
      * @type {Array}
      */
     this.deferredUpperWindowMessages_ = [];
 
     /**
@@ skipping 271 matching lines @@
     channelManager.onConnect.addListener(onConnect);
   };
 
   return PostMessageChannel;
 })();
 
 /** @override */
 Channel.create = function() {
   return new PostMessageChannel();
 };