Fix the maximum native sample rate in AudioProcessing

webrtc/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 211 matching lines @@
 
     int _instanceId;
     bool _mixFileWithMicrophone;
     uint32_t _captureLevel;
     VoEMediaProcess* external_postproc_ptr_;
     VoEMediaProcess* external_preproc_ptr_;
     bool _mute;
     int32_t _remainingMuteMicTimeMs;
     bool stereo_codec_;
     bool swap_stereo_channels_;
-    rtc::scoped_ptr<int16_t[]> mono_buffer_;
 };
 
 }  // namespace voe
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VOICE_ENGINE_TRANSMIT_MIXER_H