Standardize usage of virtual/override/final in sync/

sync/engine/directory_update_handler.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 SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
 #define SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 29 matching lines @@
 //
 // Each instance of this class represents a particular type in the
 // syncable::Directory.  It can store and retreive that type's progress markers.
 // It can also process a set of received SyncEntities and store their data.
 class SYNC_EXPORT_PRIVATE DirectoryUpdateHandler : public UpdateHandler {
  public:
   DirectoryUpdateHandler(syncable::Directory* dir,
                          ModelType type,
                          scoped_refptr<ModelSafeWorker> worker,
                          DirectoryTypeDebugInfoEmitter* debug_info_emitter);
-  virtual ~DirectoryUpdateHandler();
+  ~DirectoryUpdateHandler() override;
 
   // UpdateHandler implementation.
-  virtual void GetDownloadProgress(
+  void GetDownloadProgress(
       sync_pb::DataTypeProgressMarker* progress_marker) const override;
-  virtual void GetDataTypeContext(sync_pb::DataTypeContext* context) const
-      override;
-  virtual SyncerError ProcessGetUpdatesResponse(
+  void GetDataTypeContext(sync_pb::DataTypeContext* context) const override;
+  SyncerError ProcessGetUpdatesResponse(
       const sync_pb::DataTypeProgressMarker& progress_marker,
       const sync_pb::DataTypeContext& mutated_context,
       const SyncEntityList& applicable_updates,
       sessions::StatusController* status) override;
-  virtual void ApplyUpdates(sessions::StatusController* status) override;
-  virtual void PassiveApplyUpdates(sessions::StatusController* status) override;
+  void ApplyUpdates(sessions::StatusController* status) override;
+  void PassiveApplyUpdates(sessions::StatusController* status) override;
 
  private:
   friend class DirectoryUpdateHandlerApplyUpdateTest;
   friend class DirectoryUpdateHandlerProcessUpdateTest;
 
   // Sometimes there is nothing to do, so we can return without doing anything.
   bool IsApplyUpdatesRequired();
 
   // Processes the given SyncEntities and stores their data in the directory.
   // Their types must match this update handler's type.
@@ skipping 24 matching lines @@
   DirectoryTypeDebugInfoEmitter* debug_info_emitter_;
 
   scoped_ptr<sync_pb::GarbageCollectionDirective> cached_gc_directive_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryUpdateHandler);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_