Remove ACM AudioCodingFeedback callback object and derived classes

webrtc/modules/audio_coding/main/interface/audio_coding_module.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 29 matching lines @@
   virtual ~AudioPacketizationCallback() {}
 
   virtual int32_t SendData(FrameType frame_type,
                            uint8_t payload_type,
                            uint32_t timestamp,
                            const uint8_t* payload_data,
                            size_t payload_len_bytes,
                            const RTPFragmentationHeader* fragmentation) = 0;
 };
 
-// Callback class used for inband Dtmf detection
-class AudioCodingFeedback {
- public:
-  virtual ~AudioCodingFeedback() {}
-
-  virtual int32_t IncomingDtmf(const uint8_t digit_dtmf,
-                               const bool end) = 0;
-};
-
 // Callback class used for reporting VAD decision
 class ACMVADCallback {
  public:
   virtual ~ACMVADCallback() {}
 
   virtual int32_t InFrameType(FrameType frame_type) = 0;
 };
 
 // Callback class used for reporting receiver statistics
 class ACMVQMonCallback {
@@ skipping 916 matching lines @@
   virtual std::vector<uint16_t> GetNackList(int round_trip_time_ms) const = 0;
 
   // Returns the timing statistics for calls to Get10MsAudio.
   virtual void GetDecodingCallStatistics(
       AudioDecodingCallStats* call_stats) const = 0;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_MAIN_INTERFACE_AUDIO_CODING_MODULE_H_