Standardize usage of virtual/override/final in chrome/browser/extensions/

chrome/browser/extensions/api/storage/sync_storage_backend.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 CHROME_BROWSER_EXTENSIONS_API_STORAGE_SYNC_STORAGE_BACKEND_H_
 #define CHROME_BROWSER_EXTENSIONS_API_STORAGE_SYNC_STORAGE_BACKEND_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 27 matching lines @@
   // databases will be at base_path/extension_id.
   // |observers| is the list of observers to settings changes.
   SyncStorageBackend(
       const scoped_refptr<SettingsStorageFactory>& storage_factory,
       const base::FilePath& base_path,
       const SettingsStorageQuotaEnforcer::Limits& quota,
       const scoped_refptr<SettingsObserverList>& observers,
       syncer::ModelType sync_type,
       const syncer::SyncableService::StartSyncFlare& flare);
 
-  virtual ~SyncStorageBackend();
+  ~SyncStorageBackend() override;
 
   virtual ValueStore* GetStorage(const std::string& extension_id);
   virtual void DeleteStorage(const std::string& extension_id);
 
   // syncer::SyncableService implementation.
-  virtual syncer::SyncDataList GetAllSyncData(syncer::ModelType type)
-      const override;
-  virtual syncer::SyncMergeResult MergeDataAndStartSyncing(
+  syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const override;
+  syncer::SyncMergeResult MergeDataAndStartSyncing(
       syncer::ModelType type,
       const syncer::SyncDataList& initial_sync_data,
       scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
       scoped_ptr<syncer::SyncErrorFactory> sync_error_factory) override;
-  virtual syncer::SyncError ProcessSyncChanges(
+  syncer::SyncError ProcessSyncChanges(
       const tracked_objects::Location& from_here,
       const syncer::SyncChangeList& change_list) override;
-  virtual void StopSyncing(syncer::ModelType type) override;
+  void StopSyncing(syncer::ModelType type) override;
 
  private:
   // Gets a weak reference to the storage area for a given extension,
   // initializing sync with some initial data if sync enabled.
   SyncableSettingsStorage* GetOrCreateStorageWithSyncData(
       const std::string& extension_id,
       const base::DictionaryValue& sync_data) const;
 
   // Gets all extension IDs known to extension settings.  This may not be all
   // installed extensions.
@@ skipping 31 matching lines @@
   scoped_ptr<syncer::SyncErrorFactory> sync_error_factory_;
 
   syncer::SyncableService::StartSyncFlare flare_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncStorageBackend);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_STORAGE_SYNC_STORAGE_BACKEND_H_