modules/audio_coding: Remove some codec include dirs

webrtc/modules/audio_coding/codecs/pcm16b/include/audio_decoder_pcm16b.h

-/*
- *  Copyright (c) 2015 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_MODULES_AUDIO_CODING_CODECS_PCM16B_INCLUDE_AUDIO_DECODER_PCM16B_H_
-#define WEBRTC_MODULES_AUDIO_CODING_CODECS_PCM16B_INCLUDE_AUDIO_DECODER_PCM16B_H_
-
-#include "webrtc/base/constructormagic.h"
-#include "webrtc/modules/audio_coding/codecs/audio_decoder.h"
-
-namespace webrtc {
-
-class AudioDecoderPcm16B final : public AudioDecoder {
- public:
-  explicit AudioDecoderPcm16B(size_t num_channels);
-  void Reset() override;
-  int PacketDuration(const uint8_t* encoded, size_t encoded_len) const override;
-  size_t Channels() const override;
-
- protected:
-  int DecodeInternal(const uint8_t* encoded,
-                     size_t encoded_len,
-                     int sample_rate_hz,
-                     int16_t* decoded,
-                     SpeechType* speech_type) override;
-
- private:
-  const size_t num_channels_;
-  RTC_DISALLOW_COPY_AND_ASSIGN(AudioDecoderPcm16B);
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_PCM16B_INCLUDE_AUDIO_DECODER_PCM16B_H_