Rename experimental.accessibility to accessibilityPrivate

chrome/test/data/extensions/api_test/permissions/experimental_disabled/background.js

 // Copyright (c) 2011 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.
 
 // Calls to chrome.experimental.* functions should fail, since this extension
 // has not declared that permission.
 
 chrome.test.runTests([
   function experimental() {
     chrome.tabs.getSelected(null, function(tab) {
       try {
-        // If/when chrome.experimental.accessibility is moved out of
+        // If/when chrome.experimental.history is moved out of
         // experimental, this test needs to be updated.
-        chrome.experimental.accessibility.getAlertsForTab(
-          tab.id, function(alerts) {
+        chrome.experimental.history.getMostVisited(
+          {}, function(results) {
           chrome.test.fail();
         });
       } catch (e) {
         chrome.test.succeed();
       }
     });
   }
 ]);