Move systemInfo.cpu API out out experimental namespace.

chrome/test/data/extensions/api_test/systeminfo/cpu/test_cpu_api.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.
 
 // systeminfo.cpu api test
 // browser_tests.exe --gtest_filter=SystemInfoCpuApiTest.*
 
-chrome.systemInfo = chrome.experimental.systemInfo;
-
 var userStep = 3;
 var kernelStep = 2;
 var idleStep = 1;
 function calculateUsage(count) {
   return (100 - idleStep * 100/(userStep + kernelStep + idleStep));
 }
 
 chrome.test.runTests([
   function testGet() {
     for(var i = 0; i < 20; ++i) {
@@ skipping 15 matching lines @@
 
         chrome.test.assertEq(updateInfo.usagePerProcessor.length, 4);
         for (var i = 0; i < updateInfo.usagePerProcessor.length; ++i)
           chrome.test.assertEq(updateInfo.usagePerProcessor[i], expectedUsage);
         if (++numOfUpdatedEvent > 5)
           doneUpdatedEvent();
       });
   }
 ]);