signin: Abort previous 'channelConnected' handling on retry

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';
@@ skipping 306 matching lines @@
       this.onMessage.dispatch(e.data.payload);
     }
   };
 
   /**
    * A message channel based on PostMessagePort.
    * @extends {Channel}
    * @constructor
    */
   function PostMessageChannel() {
+    Channel.apply(this, arguments);
   };
 
   PostMessageChannel.prototype = {
     __proto__: Channel.prototype,
 
     /** @override */
     connect: function(name) {
       this.port_ = channelManager.connectToDaemon(name);
       this.port_.onMessage.addListener(this.onMessage_.bind(this));
     },
@@ skipping 26 matching lines @@
     channelManager.onConnect.addListener(onConnect);
   };
 
   return PostMessageChannel;
 })();
 
 /** @override */
 Channel.create = function() {
   return new PostMessageChannel();
 };