Remove the VoEDtmf interface.

webrtc/voice_engine/voe_dtmf_impl.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.
- */
-
-#ifndef WEBRTC_VOICE_ENGINE_VOE_DTMF_IMPL_H
-#define WEBRTC_VOICE_ENGINE_VOE_DTMF_IMPL_H
-
-#include "webrtc/voice_engine/include/voe_dtmf.h"
-#include "webrtc/voice_engine/shared_data.h"
-
-namespace webrtc {
-
-class VoEDtmfImpl : public VoEDtmf {
- public:
-  int SendTelephoneEvent(int channel,
-                         int eventCode,
-                         bool outOfBand = true,
-                         int lengthMs = 160,
-                         int attenuationDb = 10) override;
-
-  int SetSendTelephoneEventPayloadType(int channel,
-                                       unsigned char type) override;
-
-  int GetSendTelephoneEventPayloadType(int channel,
-                                       unsigned char& type) override;
-
-  int SetDtmfFeedbackStatus(bool enable, bool directFeedback = false) override;
-
-  int GetDtmfFeedbackStatus(bool& enabled, bool& directFeedback) override;
-
-  int PlayDtmfTone(int eventCode,
-                   int lengthMs = 200,
-                   int attenuationDb = 10) override;
-
- protected:
-  VoEDtmfImpl(voe::SharedData* shared);
-  ~VoEDtmfImpl() override;
-
- private:
-  bool _dtmfFeedback;
-  bool _dtmfDirectFeedback;
-  voe::SharedData* _shared;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_VOICE_ENGINE_VOE_DTMF_IMPL_H