cros: Port SAML support to webview sign-in.

chrome/browser/resources/gaia_auth/saml_injected.js

 // Copyright 2013 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
  * Script to be injected into SAML provider pages, serving three main purposes:
  * 1. Signal hosting extension that an external page is loaded so that the
  *    UI around it should be changed accordingly;
  * 2. Provide an API via which the SAML provider can pass user credentials to
@@ skipping 189 matching lines @@
         if (document.readyState == 'loading')
           return;
         initPasswordScraper();
         window.removeEventListener(event.type, listener, true);
       }, true);
     } else {
       initPasswordScraper();
     }
   }
 
-  var channel = new Channel();
+  var channel = Channel.create();
   channel.connect('injected');
   channel.sendWithCallback({name: 'getSAMLFlag'},
                            onGetSAMLFlag.bind(undefined, channel));
 })();