Replace more ObserverList with base::ObserverList.

device/bluetooth/bluetooth_audio_sink_chromeos.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_AUDIO_SINK_CHROMEOS_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_AUDIO_SINK_CHROMEOS_H_
 
 #include <stdint.h>
 #include <string>
 #include <vector>
@@ skipping 190 matching lines @@
 
   // Options used to initiate Media Endpoint and select configuration for the
   // transport.
   device::BluetoothAudioSink::Options options_;
 
   // Media Endpoint object owned by the audio sink object.
   scoped_ptr<BluetoothMediaEndpointServiceProvider> media_endpoint_;
 
   // List of observers interested in event notifications from us. Objects in
   // |observers_| are expected to outlive a BluetoothAudioSinkChromeOS object.
-  ObserverList<BluetoothAudioSink::Observer> observers_;
+  base::ObserverList<BluetoothAudioSink::Observer> observers_;
 
   // 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<BluetoothAudioSinkChromeOS> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothAudioSinkChromeOS);
 };
 
 }  // namespace chromeos
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_AUDIO_SINK_CHROMEOS_H_