Revert "Remove desktop auto-login since we don't plan on shipping it there. Refactor the base and …

chrome/browser/resources/options/browser_options.js

 // Copyright (c) 2012 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() {
   var OptionsPage = options.OptionsPage;
   var ArrayDataModel = cr.ui.ArrayDataModel;
   var RepeatingButton = cr.ui.RepeatingButton;
   var HotwordSearchSettingIndicator = options.HotwordSearchSettingIndicator;
 
@@ skipping 897 matching lines @@
       // See crbug.com/289791.
       customizeSyncButton.disabled =
           syncData.hasUnrecoverableError ||
           (!syncData.setupCompleted && !$('sync-action-link').hidden);
 
       // Move #enable-auto-login-checkbox to a different location on CrOS.
       if (cr.isChromeOs) {
         $('sync-general').insertBefore($('sync-status').nextSibling,
                                        $('enable-auto-login-checkbox'));
       }
+      $('enable-auto-login-checkbox').hidden = !syncData.autoLoginVisible;
     },
 
     /**
      * Update the UI depending on whether the current profile has a pairing for
      * Easy Unlock.
      * @param {boolean} hasPairing True if the current profile has a pairing.
      */
     updateEasyUnlock_: function(hasPairing) {
       $('easy-unlock-setup').hidden = hasPairing;
       $('easy-unlock-enable').hidden = !hasPairing;
@@ skipping 801 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });