Replace more ObserverList with base::ObserverList.

sync/internal_api/sync_manager_impl.h

 // Copyright 2012 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 SYNC_INTERNAL_API_SYNC_MANAGER_H_
 #define SYNC_INTERNAL_API_SYNC_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 255 matching lines @@
   WeakHandle<SyncManagerImpl> weak_handle_this_;
 
   // We give a handle to share_ to clients of the API for use when constructing
   // any transaction type.
   UserShare share_;
 
   // This can be called from any thread, but only between calls to
   // OpenDirectory() and ShutdownOnSyncThread().
   WeakHandle<SyncManager::ChangeObserver> change_observer_;
 
-  ObserverList<SyncManager::Observer> observers_;
+  base::ObserverList<SyncManager::Observer> observers_;
 
   // The ServerConnectionManager used to abstract communication between the
   // client (the Syncer) and the sync server.
   scoped_ptr<SyncAPIServerConnectionManager> connection_manager_;
 
   // Maintains state that affects the way we interact with different sync types.
   // This state changes when entering or exiting a configuration cycle.
   scoped_ptr<ModelTypeRegistry> model_type_registry_;
 
   // The main interface for non-blocking sync types and a thread-safe wrapper.
@@ skipping 51 matching lines @@
   scoped_ptr<SyncEncryptionHandlerImpl> sync_encryption_handler_;
 
   base::WeakPtrFactory<SyncManagerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncManagerImpl);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_SYNC_MANAGER_H_