Move the `privacy` extension API out of experimental.

chrome/test/data/extensions/api_test/preference/clear/test.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.
 
 // Content settings API test
 // Run with browser_tests --gtest_filter=ExtensionApiTest.PreferenceClear
 
-var pw = chrome.experimental.privacy.websites;
+var pw = chrome.privacy.websites;
 chrome.test.runTests([
   function getThirdPartyCookiesAllowed() {
     pw.thirdPartyCookiesAllowed.get({}, chrome.test.callbackPass(
         function(allowed) {
           chrome.test.assertEq(
               allowed,
               {
                 'value': false,
                 'levelOfControl': "controllable_by_this_extension"
               },
@@ skipping 14 matching lines @@
           chrome.test.assertEq(
               allowed,
               {
                 'value': false,
                 'levelOfControl': "controllable_by_this_extension"
               },
               "third-party cookies should be blocked");
         }));
   }
 ]);