Properly clear the controlled-by attribute if signout is allowed.

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;
 
   //
@@ skipping 666 matching lines @@
       $('customize-sync').hidden = !syncData.signedIn ||
           syncData.managed || !syncData.syncSystemEnabled;
 
       var startStopButton = $('start-stop-sync');
       // Disable the "start/stop syncing" if we're currently signing in, or
       // if we're already signed in and signout is not allowed.
       startStopButton.disabled = syncData.setupInProgress ||
           !syncData.signoutAllowed;
       if (!syncData.signoutAllowed)
         $('start-stop-sync-indicator').setAttribute('controlled-by', 'policy');
+      else
+        $('start-stop-sync-indicator').removeAttribute('controlled-by');
       startStopButton.hidden =
           syncData.setupCompleted && cr.isChromeOS;
       startStopButton.textContent =
           syncData.signedIn ?
               loadTimeData.getString('syncButtonTextStop') :
           syncData.setupInProgress ?
               loadTimeData.getString('syncButtonTextInProgress') :
               loadTimeData.getString('syncButtonTextStart');
       $('start-stop-sync-indicator').hidden = startStopButton.hidden;
 
@@ skipping 693 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });