Do not update url of Chrome signin page for the inital and continue page

chrome/browser/resources/gaia_auth_host/gaia_auth_host.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 An UI component to host gaia auth extension in an iframe.
  * After the component binds with an iframe, call its {@code load} to start the
  * authentication flow. There are two events would be raised after this point:
  * a 'ready' event when the authentication UI is ready to use and a 'completed'
  * event when the authentication is completed successfully. If caller is
@@ skipping 336 matching lines @@
         return;
       }
 
       if (msg.method == 'reportState') {
         var newUrl = setQueryParam(location, 'frameUrl', msg.src);
         if (history.state) {
           if (history.state.src != msg.src) {
             history.pushState({src: msg.src}, '', newUrl);
           }
         } else {
-          history.replaceState({src: msg.src}, '', newUrl);
+          history.replaceState({src: msg.src});
         }
         return;
       }
 
       if (msg.method == 'switchToFullTab') {
         chrome.send('switchToFullTab', [msg.url]);
         return;
       }
 
       console.error('Unknown message method=' + msg.method);
@@ skipping 23 matching lines @@
 
   GaiaAuthHost.SUPPORTED_PARAMS = SUPPORTED_PARAMS;
   GaiaAuthHost.LOCALIZED_STRING_PARAMS = LOCALIZED_STRING_PARAMS;
   GaiaAuthHost.AuthMode = AuthMode;
   GaiaAuthHost.AuthFlow = AuthFlow;
 
   return {
     GaiaAuthHost: GaiaAuthHost
   };
 });