Reland "Removing webrtc::AudioFrame::energy_."

webrtc/modules/audio_conference_mixer/source/audio_frame_manipulator.h

 /*
  *  Copyright (c) 2011 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_MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_AUDIO_FRAME_MANIPULATOR_H_
 #define WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_AUDIO_FRAME_MANIPULATOR_H_
 
+#include "webrtc/typedefs.h"
+
 namespace webrtc {
 class AudioFrame;
 
 // Updates the audioFrame's energy (based on its samples).
-void CalculateEnergy(AudioFrame& audioFrame);
+uint32_t CalculateEnergy(const AudioFrame& audioFrame);
 
 // Apply linear step function that ramps in/out the audio samples in audioFrame
 void RampIn(AudioFrame& audioFrame);
 void RampOut(AudioFrame& audioFrame);
 
 }  // namespace webrtc
 
 #endif // WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_AUDIO_FRAME_MANIPULATOR_H_