Revert of Revert "Remove CpuMonitor and related, unused, code."

webrtc/base/fakecpumonitor.h

-/*
- *  Copyright 2013 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_BASE_FAKECPUMONITOR_H_
-#define WEBRTC_BASE_FAKECPUMONITOR_H_
-
-#include "webrtc/base/cpumonitor.h"
-
-namespace rtc {
-
-class FakeCpuMonitor : public rtc::CpuMonitor {
- public:
-  explicit FakeCpuMonitor(Thread* thread)
-      : CpuMonitor(thread) {
-  }
-  ~FakeCpuMonitor() {
-  }
-
-  virtual void OnMessage(rtc::Message* msg) {
-  }
-};
-
-}  // namespace rtc
-
-#endif  // WEBRTC_BASE_FAKECPUMONITOR_H_