Move the `privacy` extension API out of experimental.

chrome/test/data/extensions/api_test/preference/persistent_incognito/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.PreferencePersistentIncognito
 
-var pw = chrome.experimental.privacy.websites;
+var pw = chrome.privacy.websites;
 function expect(expected, message) {
   return chrome.test.callbackPass(function(value) {
     chrome.test.assertNoLastError();
     chrome.test.assertEq(expected, value, message);
   });
 }
 chrome.test.runTests([
   function getRegular() {
     pw.thirdPartyCookiesAllowed.get(
         {},
@@ skipping 23 matching lines @@
   },
   function getIncognito2() {
     pw.thirdPartyCookiesAllowed.get(
         { 'incognito': true },
         expect({ 'value': false,
                  'incognitoSpecific': true,
                  'levelOfControl': "controlled_by_this_extension" },
                "third-party cookies should be blocked in incognito mode"));
   },
 ]);