Revert of Chrome power profiler service

content/browser/power_profiler/power_profiler_observer.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_OBSERVER_H_
-#define CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_OBSERVER_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "content/common/content_export.h"
-
-namespace content {
-
-struct PowerEvent;
-typedef std::vector<PowerEvent> PowerEventVector;
-
-// A class used to monitor power usage data.
-class CONTENT_EXPORT PowerProfilerObserver {
- public:
-  PowerProfilerObserver() {}
-  virtual ~PowerProfilerObserver() {}
-
-  // This method will be called on the UI thread.
-  virtual void OnPowerEvent(const PowerEventVector&) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PowerProfilerObserver);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_OBSERVER_H_