Delete the audio modem and copresence private APIs.

components/audio_modem/audio_player.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_PLAYER_H_
-#define COMPONENTS_AUDIO_MODEM_AUDIO_PLAYER_H_
-
-#include <vector>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-
-namespace media {
-class AudioBusRefCounted;
-}
-
-namespace audio_modem {
-
-// The AudioPlayerImpl class will play a set of samples till it is told to stop.
-class AudioPlayer {
- public:
-  // Initializes the object. Do not use this object before calling this method.
-  virtual void Initialize() = 0;
-
-  // Play the given samples. These samples will keep on being played in a loop
-  // till we explicitly tell the player to stop playing. If we are already
-  // playing, this call will be ignored.
-  virtual void Play(
-      const scoped_refptr<media::AudioBusRefCounted>& samples) = 0;
-
-  // Stop playing. If we're already stopped, this call will be ignored.
-  virtual void Stop() = 0;
-
-  // Cleans up and deletes this object. Do not use object after this call.
-  virtual void Finalize() = 0;
-
- protected:
-  virtual ~AudioPlayer() {}
-};
-
-}  // namespace audio_modem
-
-#endif  // COMPONENTS_AUDIO_MODEM_AUDIO_PLAYER_H_