Revert of Chrome power profiler service

content/browser/power_profiler/power_profiler_service.h

-// Copyright 2014 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 CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_
-#define CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_
-
-#include "base/basictypes.h"
-#include "base/memory/singleton.h"
-#include "base/observer_list.h"
-#include "base/task_runner.h"
-#include "base/timer/timer.h"
-#include "content/browser/power_profiler/power_data_provider.h"
-#include "content/browser/power_profiler/power_profiler_observer.h"
-#include "content/common/content_export.h"
-
-namespace content {
-
-// A class used to query power information and notify the observers.
-class CONTENT_EXPORT PowerProfilerService {
- public:
-  static PowerProfilerService* GetInstance();
-
-  // Add and remove an observer.
-  void AddObserver(PowerProfilerObserver* observer);
-  void RemoveObserver(PowerProfilerObserver* observer);
-
-  bool IsAvailable();
-
- private:
-  enum Status {
-    UNINITIALIZED,
-    INITIALIZED,  // Initialized, profiling has not started.
-    PROFILING
-  };
-
-  friend struct DefaultSingletonTraits<PowerProfilerService>;
-  friend class PowerProfilerServiceTest;
-
-  PowerProfilerService();
-  virtual ~PowerProfilerService();
-
-  PowerProfilerService(scoped_ptr<PowerDataProvider> provider,
-                       scoped_refptr<base::TaskRunner> task_runner,
-                       const base::TimeDelta& sample_period);
-
-  void Start();
-  void Stop();
-
-  // Query power data from PowerDataProvider, executes on the WorkerPool thread.
-  void QueryDataOnTaskRunner();
-
-  // Initiate the query on the UI thread, the task is delegated to
-  // QueryDataOnTaskRunner.
-  void QueryData();
-
-  // Executes on the UI thread.
-  void Notify(const PowerEventVector&);
-
-  base::RepeatingTimer<PowerProfilerService> query_power_timer_;
-  scoped_refptr<base::TaskRunner> task_runner_;
-
-  Status status_;
-
-  // Sampling period of power data measurement.
-  const base::TimeDelta sample_period_;
-  ObserverList<PowerProfilerObserver> observers_;
-
-  scoped_ptr<PowerDataProvider> data_provider_;
-
-  DISALLOW_COPY_AND_ASSIGN(PowerProfilerService);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_