Fix for sync setup UI when user is already logged in.

chrome/browser/resources/options/sync_setup_overlay.js

 // Copyright (c) 2011 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.
 
 cr.define('options', function() {
   const OptionsPage = options.OptionsPage;
 
   // Variable to track if a captcha challenge was issued. If this gets set to
   // true, it stays that way until we are told about successful login from
   // the browser.  This means subsequent errors (like invalid password) are
@@ skipping 560 matching lines @@
       var email = $('gaia-email');
       var passwd = $('gaia-passwd');
       if (f) {
         if (args.user != undefined) {
           if (email.value != args.user)
             passwd.value = ""; // Reset the password field
           email.value = args.user;
         }
 
         if (!args.editable_user) {
-          email.style.display = 'none';
-          var span = document.getElementById('email-readonly');
-          span.appendChild(document.createTextNode(email.value));
-          span.style.display = 'inline';
+          email.hidden = true;
+          var span = $('email-readonly');
+          span.textContent = email.value;
+          span.hidden = false;
           $('create-account-div').hidden = true;
         }
 
         f.accessCode.disabled = true;
       }
 
       if (1 == args.error) {
         var access_code = document.getElementById('access-code');
         if (access_code.value && access_code.value != "") {
           $('errormsg-0-access-code').hidden = false;
@@ skipping 129 matching lines @@
 
   SyncSetupOverlay.showSuccessAndSettingUp = function() {
     SyncSetupOverlay.getInstance().showSuccessAndSettingUp_();
   };
 
   // Export
   return {
     SyncSetupOverlay: SyncSetupOverlay
   };
 });