Replace more ObserverList with base::ObserverList.

device/bluetooth/bluetooth_advertisement.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_ADVERTISEMENT_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADVERTISEMENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 108 matching lines @@
  protected:
   friend class base::RefCounted<BluetoothAdvertisement>;
 
   BluetoothAdvertisement();
 
   // The destructor will unregister this advertisement.
   virtual ~BluetoothAdvertisement();
 
   // List of observers interested in event notifications from us. Objects in
   // |observers_| are expected to outlive a BluetoothAdvertisement object.
-  ObserverList<BluetoothAdvertisement::Observer> observers_;
+  base::ObserverList<BluetoothAdvertisement::Observer> observers_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothAdvertisement);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADVERTISEMENT_H_