Merge NetworkTimeNotifier to NetworkTimeTracker

chrome/browser/network_time/network_time_service.h

 // Copyright 2013 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_NETWORK_TIME_NETWORK_TIME_SERVICE_H_
 #define CHROME_BROWSER_NETWORK_TIME_NETWORK_TIME_SERVICE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "components/keyed_service/core/keyed_service.h"
 
-class NetworkTimeTracker;
 class Profile;
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 // NetworkTimeService can convert local time to network time.
 class NetworkTimeService : public KeyedService {
  public:
   explicit NetworkTimeService(Profile* profile);
   virtual ~NetworkTimeService();
 
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // Return network time corresponding to |local_time| if possible. Return
   // |local_time| otherwise.
   base::Time GetNetworkTime(const base::Time& local_time);
 
   // Shortcut to get current time.
   base::Time GetNetworkNow();
 
   virtual void Shutdown() OVERRIDE;
 
  private:
   Profile* profile_;
-  scoped_ptr<NetworkTimeTracker> network_time_tracker_;
 };
 
 #endif  // CHROME_BROWSER_NETWORK_TIME_NETWORK_TIME_SERVICE_H_