Replace more ObserverList with base::ObserverList.

device/nfc/nfc_adapter_chromeos.h

 // Copyright 2013 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_NFC_NFC_ADAPTER_CHROMEOS_H_
 #define DEVICE_NFC_NFC_ADAPTER_CHROMEOS_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "chromeos/dbus/nfc_adapter_client.h"
@@ skipping 80 matching lines @@
   // Called by dbus:: on completion of the D-Bus method call to stop polling.
   void OnStopPolling(const base::Closure& callback);
   void OnStopPollingError(const ErrorCallback& error_callback,
                           const std::string& error_name,
                           const std::string& error_message);
 
   // Object path of the adapter that we are currently tracking.
   dbus::ObjectPath object_path_;
 
   // List of observers interested in event notifications from us.
-  ObserverList<device::NfcAdapter::Observer> observers_;
+  base::ObserverList<device::NfcAdapter::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<NfcAdapterChromeOS> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NfcAdapterChromeOS);
 };
 
 }  // namespace chromeos
 
 #endif  // DEVICE_NFC_NFC_ADAPTER_CHROMEOS_H_