Delete unused BluetoothAudioSink code.

device/bluetooth/bluetooth_adapter_android.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 DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_ANDROID_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_ANDROID_H_
 
 #include <memory>
 
 #include "base/android/jni_android.h"
@@ skipping 60 matching lines @@
   void CreateRfcommService(
       const BluetoothUUID& uuid,
       const ServiceOptions& options,
       const CreateServiceCallback& callback,
       const CreateServiceErrorCallback& error_callback) override;
   void CreateL2capService(
       const BluetoothUUID& uuid,
       const ServiceOptions& options,
       const CreateServiceCallback& callback,
       const CreateServiceErrorCallback& error_callback) override;
-  void RegisterAudioSink(
-      const BluetoothAudioSink::Options& options,
-      const AcquiredCallback& callback,
-      const BluetoothAudioSink::ErrorCallback& error_callback) override;
   void RegisterAdvertisement(
       std::unique_ptr<BluetoothAdvertisement::Data> advertisement_data,
       const CreateAdvertisementCallback& callback,
       const AdvertisementErrorCallback& error_callback) override;
   BluetoothLocalGattService* GetGattService(
       const std::string& identifier) const override;
 
   // Called when adapter state changes.
   void OnAdapterStateChanged(JNIEnv* env,
                              const base::android::JavaParamRef<jobject>& caller,
@@ skipping 49 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothAdapterAndroid> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothAdapterAndroid);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_ANDROID_H_