[Sync] Replace typedef with using.

components/sync/model/sync_change_processor.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 COMPONENTS_SYNC_MODEL_SYNC_CHANGE_PROCESSOR_H_
 #define COMPONENTS_SYNC_MODEL_SYNC_CHANGE_PROCESSOR_H_
 
 #include <string>
 #include <vector>
 
 #include "components/sync/base/model_type.h"
 #include "components/sync/model/sync_data.h"
 #include "components/sync/model/sync_error.h"
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace syncer {
 
 class SyncChange;
 
 class LocalChangeObserver;
 
-typedef std::vector<SyncChange> SyncChangeList;
+using SyncChangeList = std::vector<SyncChange>;
 
 // An interface for services that handle receiving SyncChanges.
 class SyncChangeProcessor {
  public:
   // Whether a context change should force a datatype refresh or not.
   enum ContextRefreshStatus { NO_REFRESH, REFRESH_NEEDED };
-  typedef base::Callback<void(const SyncData&)> GetSyncDataCallback;
+  using GetSyncDataCallback = base::Callback<void(const SyncData&)>;
 
   SyncChangeProcessor();
   virtual ~SyncChangeProcessor();
 
   // Process a list of SyncChanges.
   // Returns: A default SyncError (IsSet() == false) if no errors were
   //          encountered, and a filled SyncError (IsSet() == true)
   //          otherwise.
   // Inputs:
   //   |from_here|: allows tracking of where sync changes originate.
@@ skipping 37 matching lines @@
   // Adds an observer of local sync changes. This observer is notified when
   // local sync changes are applied by GenericChangeProcessor. observer is
   // not owned by the SyncChangeProcessor.
   virtual void AddLocalChangeObserver(LocalChangeObserver* observer);
   virtual void RemoveLocalChangeObserver(LocalChangeObserver* observer);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_MODEL_SYNC_CHANGE_PROCESSOR_H_