Standardize usage of virtual/override/final in components/

components/bookmarks/browser/bookmark_storage.h

Index: components/bookmarks/browser/bookmark_storage.h
diff --git a/components/bookmarks/browser/bookmark_storage.h b/components/bookmarks/browser/bookmark_storage.h
index 262c6ab7097d5c4096e5fd56e194aa9fd211e80e..9fa8646d9aea310e67094722461610c1ab9d1858 100644
--- a/components/bookmarks/browser/bookmark_storage.h
+++ b/components/bookmarks/browser/bookmark_storage.h
@@ -142,7 +142,7 @@ class BookmarkStorage : public base::ImportantFileWriter::DataSerializer {
   BookmarkStorage(BookmarkModel* model,
                   const base::FilePath& profile_path,
                   base::SequencedTaskRunner* sequenced_task_runner);
-  virtual ~BookmarkStorage();
+  ~BookmarkStorage() override;
 
   // Loads the bookmarks into the model, notifying the model when done. This
   // takes ownership of |details| and send the |OnLoadFinished| callback from
@@ -162,7 +162,7 @@ class BookmarkStorage : public base::ImportantFileWriter::DataSerializer {
   void OnLoadFinished(scoped_ptr<BookmarkLoadDetails> details);
 
   // ImportantFileWriter::DataSerializer implementation.
-  virtual bool SerializeData(std::string* output) override;
+  bool SerializeData(std::string* output) override;
 
  private:
   // Serializes the data and schedules save using ImportantFileWriter.