Remove dependency on AudioStub in ConnectionToClient

remoting/codec/audio_decoder_verbatim.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef REMOTING_CODEC_AUDIO_DECODER_VERBATIM_H_
-#define REMOTING_CODEC_AUDIO_DECODER_VERBATIM_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "remoting/codec/audio_decoder.h"
-
-namespace remoting {
-
-class AudioPacket;
-
-// The decoder for raw audio streams.
-class AudioDecoderVerbatim : public AudioDecoder {
- public:
-  AudioDecoderVerbatim();
-  ~AudioDecoderVerbatim() override;
-
-  std::unique_ptr<AudioPacket> Decode(
-      std::unique_ptr<AudioPacket> packet) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AudioDecoderVerbatim);
-};
-
-}  // namespace remoting
-
-#endif  // REMOTING_CODEC_AUDIO_DECODER_VERBATIM_H_