Remove voe::OutputMixer and AudioConferenceMixer.

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 MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_AUDIO_FRAME_MANIPULATOR_H_
-#define MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_AUDIO_FRAME_MANIPULATOR_H_
-
-#include "typedefs.h"  // NOLINT(build/include)
-
-namespace webrtc {
-class AudioFrame;
-
-// Updates the audioFrame's energy (based on its samples).
-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 // MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_AUDIO_FRAME_MANIPULATOR_H_