Replace more ObserverList with base::ObserverList.

components/ownership/owner_settings_service.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_OWNERSHIP_OWNER_SETTINGS_SERVICE_H_
 #define COMPONENTS_OWNERSHIP_OWNER_SETTINGS_SERVICE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 117 matching lines @@
   virtual void OnPostKeypairLoadedActions() = 0;
 
   scoped_refptr<ownership::PublicKey> public_key_;
 
   scoped_refptr<ownership::PrivateKey> private_key_;
 
   scoped_refptr<ownership::OwnerKeyUtil> owner_key_util_;
 
   std::vector<IsOwnerCallback> pending_is_owner_callbacks_;
 
-  ObserverList<Observer> observers_;
+  base::ObserverList<Observer> observers_;
 
   base::ThreadChecker thread_checker_;
 
  private:
   base::WeakPtrFactory<OwnerSettingsService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OwnerSettingsService);
 };
 
 }  // namespace ownership
 
 #endif  // COMPONENTS_OWNERSHIP_OWNER_SETTINGS_SERVICE_H_