Replace more ObserverList with base::ObserverList.

components/proximity_auth/screenlock_bridge.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 COMPONENTS_PROXIMITY_AUTH_SCREENLOCK_BRIDGE_H_
 #define COMPONENTS_PROXIMITY_AUTH_SCREENLOCK_BRIDGE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 162 matching lines @@
 
   LockHandler* lock_handler() { return lock_handler_; }
 
   std::string focused_user_id() const { return focused_user_id_; }
 
  private:
   ProximityAuthClient* client_;  // Not owned. Must outlive this object.
   LockHandler* lock_handler_;    // Not owned
   // The last focused user's id.
   std::string focused_user_id_;
-  ObserverList<Observer, true> observers_;
+  base::ObserverList<Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenlockBridge);
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_SCREENLOCK_BRIDGE_H_