Remove ACM AudioCodingFeedback callback object and derived classes

webrtc/modules/audio_coding/main/test/utility.h

Index: webrtc/modules/audio_coding/main/test/utility.h
diff --git a/webrtc/modules/audio_coding/main/test/utility.h b/webrtc/modules/audio_coding/main/test/utility.h
index eccb68f6d1e0766bb3d52e729f64f3dac248834f..6998538dddbb6573c56724c63cf92bc3fc29959f 100644
--- a/webrtc/modules/audio_coding/main/test/utility.h
+++ b/webrtc/modules/audio_coding/main/test/utility.h
@@ -115,19 +115,6 @@ void PrintCodecs();
 
 bool FixedPayloadTypeCodec(const char* payloadName);
 
-class DTMFDetector : public AudioCodingFeedback {
- public:
-  DTMFDetector();
-  ~DTMFDetector();
-  // used for inband DTMF detection
-  int32_t IncomingDtmf(const uint8_t digitDtmf, const bool toneEnded);
-  void PrintDetectedDigits();
-
- private:
-  uint32_t _toneCntr[1000];
-
-};
-
 class VADCallback : public ACMVADCallback {
  public:
   VADCallback();