Delete the audio modem and copresence private APIs.

components/audio_modem/audio_recorder.h

-// Copyright 2015 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 COMPONENTS_AUDIO_MODEM_AUDIO_RECORDER_H_
-#define COMPONENTS_AUDIO_MODEM_AUDIO_RECORDER_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "media/audio/audio_io.h"
-#include "media/base/audio_converter.h"
-#include "media/base/audio_parameters.h"
-
-namespace audio_modem {
-
-// The AudioRecorder class will record audio until told to stop.
-class AudioRecorder {
- public:
-  using RecordedSamplesCallback = base::Callback<void(const std::string&)>;
-
-  // Initializes the object. Do not use this object before calling this method.
-  virtual void Initialize(const RecordedSamplesCallback& decode_callback) = 0;
-
-  // If we are already recording, this function will do nothing.
-  virtual void Record() = 0;
-  // If we are already stopped, this function will do nothing.
-  virtual void Stop() = 0;
-
-  // Cleans up and deletes this object. Do not use object after this call.
-  virtual void Finalize() = 0;
-
- protected:
-  virtual ~AudioRecorder() {}
-};
-
-}  // namespace audio_modem
-
-#endif  // COMPONENTS_AUDIO_MODEM_AUDIO_RECORDER_H_