Standardize usage of virtual/override/final in components/

components/sync_driver/data_type_controller.h

Index: components/sync_driver/data_type_controller.h
diff --git a/components/sync_driver/data_type_controller.h b/components/sync_driver/data_type_controller.h
index 629919d00304524b6fc081fdb8fd9ba778adbac8..dd645b373ad425432a0687063c5f3546b06f75aa 100644
--- a/components/sync_driver/data_type_controller.h
+++ b/components/sync_driver/data_type_controller.h
@@ -128,7 +128,7 @@ class DataTypeController
 
   // Partial implementation of DataTypeErrorHandler.
   // This is thread safe.
-  virtual syncer::SyncError CreateAndUploadError(
+  syncer::SyncError CreateAndUploadError(
       const tracked_objects::Location& location,
       const std::string& message,
       syncer::ModelType type) override;
@@ -156,7 +156,7 @@ class DataTypeController
   // us know that it is safe to start associating.
   virtual void OnModelLoaded() = 0;
 
-  virtual ~DataTypeController();
+  ~DataTypeController() override;
 
   syncer::UserShare* user_share() const;