Modify UpdateLibrary to use async RequestUpdateCheck call

chrome/browser/chromeos/cros/mock_update_library.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_CROS_MOCK_UPDATE_LIBRARY_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_MOCK_UPDATE_LIBRARY_H_
 #pragma once
 
 #include "base/observer_list.h"
 #include "chrome/browser/chromeos/cros/update_library.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace chromeos {
 
 class MockUpdateLibrary : public UpdateLibrary {
  public:
   MockUpdateLibrary() {}
   virtual ~MockUpdateLibrary() {}
   MOCK_METHOD1(AddObserver, void(Observer*));  // NOLINT
   MOCK_METHOD1(RemoveObserver, void(Observer*));  // NOLINT
-  MOCK_METHOD0(CheckForUpdate, bool(void));
+  MOCK_METHOD2(RequestUpdateCheck, void(chromeos::UpdateCallback, void*));
   MOCK_METHOD0(RebootAfterUpdate, bool(void));
   MOCK_METHOD1(SetReleaseTrack, bool(const std::string&));
   MOCK_METHOD0(GetReleaseTrack, std::string());
   MOCK_CONST_METHOD0(status, const Status&(void));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockUpdateLibrary);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_MOCK_UPDATE_LIBRARY_H_