Remove voe::Statistics.

voice_engine/transmit_mixer.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 18 matching lines @@
 #endif
 
 namespace webrtc {
 class AudioProcessing;
 class ProcessThread;
 
 namespace voe {
 
 class ChannelManager;
 class MixedAudio;
-class Statistics;
 
 class TransmitMixer {
 public:
     static int32_t Create(TransmitMixer*& mixer, uint32_t instanceId);
 
     static void Destroy(TransmitMixer*& mixer);
 
     void SetEngineInformation(ChannelManager* channelManager);
 
     int32_t SetAudioProcessingModule(AudioProcessing* audioProcessingModule);
@@ skipping 77 matching lines @@
 
     int _instanceId = 0;
     uint32_t _captureLevel = 0;
     bool stereo_codec_ = false;
     bool swap_stereo_channels_ = false;
 };
 }  // namespace voe
 }  // namespace webrtc
 
 #endif  // VOICE_ENGINE_TRANSMIT_MIXER_H_