Removed callback between old AudioConferenceMixer and OutputMixer. The audio frame with mixed audio…

webrtc/modules/audio_mixer/include/audio_mixer_defines.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.
  */
 
@@ skipping 46 matching lines @@
   // This function specifies the sampling frequency needed for the AudioFrame
   // for future GetAudioFrame(..) calls.
   virtual int32_t NeededFrequency(int32_t id) const = 0;
 
   NewMixHistory* _mixHistory;
 
  protected:
   MixerAudioSource();
   virtual ~MixerAudioSource();
 };
-
-class OldAudioMixerOutputReceiver {
- public:
-  // This callback function provides the mixed audio for this mix iteration.
-  // Note that uniqueAudioFrames is an array of AudioFrame pointers with the
-  // size according to the size parameter.
-  virtual void NewMixedAudio(const int32_t id,
-                             const AudioFrame& generalAudioFrame,
-                             const AudioFrame** uniqueAudioFrames,
-                             const uint32_t size) = 0;
-
- protected:
-  OldAudioMixerOutputReceiver() {}
-  virtual ~OldAudioMixerOutputReceiver() {}
-};
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_MIXER_INCLUDE_AUDIO_MIXER_DEFINES_H_