Revert of Implement AudioReceiveStream::GetStats().

webrtc/voice_engine/voice_engine_impl.h

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 110 matching lines @@
         _ref_count(0),
         own_config_(owns_config ? config : NULL) {
   }
   ~VoiceEngineImpl() override { assert(_ref_count.Value() == 0); }
 
   int AddRef();
 
   // This implements the Release() method for all the inherited interfaces.
   int Release() override;
 
- // This is *protected* so that FakeVoiceEngine can inherit from the class and
- // manipulate the reference count. See: fake_voice_engine.h.
- protected:
+ private:
   Atomic32 _ref_count;
   rtc::scoped_ptr<const Config> own_config_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VOICE_ENGINE_VOICE_ENGINE_IMPL_H