Delete unused BluetoothAudioSink code.

device/bluetooth/bluetooth_audio_sink.h

-// Copyright 2014 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 DEVICE_BLUETOOTH_BLUETOOTH_AUDIO_SINK_H_
-#define DEVICE_BLUETOOTH_BLUETOOTH_AUDIO_SINK_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "device/bluetooth/bluetooth_export.h"
-
-namespace device {
-
-// TODO(mcchou): Define a BluetoothAudioSink specific IOBuffer abstraction.
-
-// BluetoothAudioSink represents a local A2DP audio sink where a remote device
-// can stream audio data. Once a BluetoothAudioSink is successfully registered,
-// user applications can obtain a pointer to a BluetoothAudioSink object via
-// the interface provided by BluetoothAdapter. The validity of a
-// BluetoothAudioSink depends on whether BluetoothAdapter is present and whether
-// it is powered.
-class DEVICE_BLUETOOTH_EXPORT BluetoothAudioSink
-    : public base::RefCounted<BluetoothAudioSink> {
- public:
-  // Possible values indicating the connection states between the
-  // BluetoothAudioSink and the remote device.
-  enum State {
-    STATE_INVALID,  // BluetoothAdapter not presented or not powered.
-    STATE_DISCONNECTED,  // Not connected.
-    STATE_IDLE,  // Connected but not streaming.
-    STATE_PENDING,  // Connected, streaming but not acquired.
-    STATE_ACTIVE,  // Connected, streaming and acquired.
-  };
-
-  // Possible types of error raised by Audio Sink object.
-  enum ErrorCode {
-    ERROR_UNSUPPORTED_PLATFORM,  // A2DP sink not supported on current platform.
-    ERROR_INVALID_ADAPTER,  // BluetoothAdapter not present/powered.
-    ERROR_NOT_REGISTERED,  // BluetoothAudioSink not registered.
-    ERROR_NOT_UNREGISTERED,  // BluetoothAudioSink not unregistered.
-  };
-
-  // Options to configure an A2DP audio sink.
-  struct Options {
-    Options();
-    ~Options();
-
-    uint8_t codec;
-    std::vector<uint8_t> capabilities;
-  };
-
-  // Interface for observing changes from a BluetoothAudioSink.
-  class Observer {
-   public:
-    virtual ~Observer() {}
-
-    // Called when the state of the BluetoothAudioSink object is changed.
-    // |audio_sink| indicates the object being changed, and |state| indicates
-    // the new state of that object.
-    virtual void BluetoothAudioSinkStateChanged(
-        BluetoothAudioSink* audio_sink,
-        BluetoothAudioSink::State state) = 0;
-
-    // Called when the volume of the BluetoothAudioSink object is changed.
-    // |audio_sink| indicates the object being changed, and |volume| indicates
-    // the new volume level of that object.
-    virtual void BluetoothAudioSinkVolumeChanged(
-        BluetoothAudioSink* audio_sink,
-        uint16_t volume) = 0;
-
-    // Called when there is audio data available. |audio_sink| indicates the
-    // object being changed. |data| is the pointer to the audio data and |size|
-    // is the number of bytes in |data|. |read_mtu| is the max size of the RTP
-    // packet. This method provides the raw audio data which hasn't been
-    // processed, so RTP assembling and SBC decoding need to be handled in order
-    // to get PCM data.
-    virtual void BluetoothAudioSinkDataAvailable(BluetoothAudioSink* audio_sink,
-                                                 char* data,
-                                                 size_t size,
-                                                 uint16_t read_mtu) = 0;
-  };
-
-  // The ErrorCallback is used for the methods that can fail in which case it
-  // is called.
-  typedef base::Callback<void(ErrorCode)> ErrorCallback;
-
-  // Possible volumes for media transport are 0-127, and 128 is used to
-  // represent invalid volume.
-  static const uint16_t kInvalidVolume;
-
-  // Unregisters the audio sink. An audio sink will unregister itself
-  // automatically in its destructor, but calling Unregister is recommended,
-  // since user applications can be notified of an error returned by the call.
-  virtual void Unregister(const base::Closure& callback,
-                          const ErrorCallback& error_callback) = 0;
-
-  // Adds and removes an observer for events on the BluetoothAudioSink object.
-  // If monitoring multiple audio sinks, check the |audio_sink| parameter of
-  // observer methods to determine which audio sink is issuing the event.
-  virtual void AddObserver(Observer* observer) = 0;
-  virtual void RemoveObserver(Observer* observer) = 0;
-
-  // Getters for state and volume.
-  virtual State GetState() const = 0;
-
-  // Returns the current volume level of the audio sink. The valid volumes are
-  // 0-127, and |kInvalidVolume| is returned instead if the volume is unknown.
-  virtual uint16_t GetVolume() const = 0;
-
- protected:
-  friend class base::RefCounted<BluetoothAudioSink>;
-  BluetoothAudioSink();
-
-  // The destructor invokes Unregister() to ensure the audio sink will be
-  // unregistered even if the user applications fail to do so.
-  virtual ~BluetoothAudioSink();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(BluetoothAudioSink);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_BLUETOOTH_BLUETOOTH_AUDIO_SINK_H_