Move SystemMonitor to src/chrome/common....

app/hi_res_timer_manager.h

-// Copyright (c) 2009 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 APP_HI_RES_TIMER_MANAGER_H_
-#define APP_HI_RES_TIMER_MANAGER_H_
-#pragma once
-
-#include "app/system_monitor.h"
-
-// Ensures that the Windows high resolution timer is only used
-// when not running on battery power.
-class HighResolutionTimerManager : public SystemMonitor::PowerObserver {
- public:
-  HighResolutionTimerManager();
-  virtual ~HighResolutionTimerManager();
-
-  // SystemMonitor::PowerObserver:
-  virtual void OnPowerStateChange(bool on_battery_power);
-
- private:
-  // Enable or disable the faster multimedia timer.
-  void UseHiResClock(bool use);
-
-  bool hi_res_clock_used_;
-
-  DISALLOW_COPY_AND_ASSIGN(HighResolutionTimerManager);
-};
-
-#endif  // APP_HI_RES_TIMER_MANAGER_H_