Move the `privacy` extension API out of experimental.

chrome/common/extensions/docs/examples/api/preferences/allowThirdPartyCookies/popup.js

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 
-var pref = chrome.experimental.privacy.websites.thirdPartyCookiesAllowed;
+var pref = chrome.privacy.websites.thirdPartyCookiesAllowed;
 
 function $(id) {
   return document.getElementById(id);
 }
 
 /**
  * Returns whether the |levelOfControl| means that the extension can change the
  * preference value.
  *
  * @param levelOfControl{string}
@@ skipping 101 matching lines @@
     // Explicitly set the value for incognito mode.
     pref.get({'incognito': true}, function(settings) {
       pref.set({'incognito': true, 'value': settings.value});
     });
   }
   document.getElementById('incognitoValue').disabled = !value;
 }
 
 // Call `init` to kick things off.
 document.addEventListener('DOMContentLoaded', init);