Add OVERRIDE to chrome/browser/.

chrome/browser/bookmarks/bookmark_storage.h

Index: chrome/browser/bookmarks/bookmark_storage.h
diff --git a/chrome/browser/bookmarks/bookmark_storage.h b/chrome/browser/bookmarks/bookmark_storage.h
index 135f0d4602382df4ec7ac72010f35bc857b12d2b..fb61e4a2e3312e8e71cf822eb0a83ad4f3d2b605 100644
--- a/chrome/browser/bookmarks/bookmark_storage.h
+++ b/chrome/browser/bookmarks/bookmark_storage.h
@@ -108,7 +108,7 @@ class BookmarkStorage : public content::NotificationObserver,
   void BookmarkModelDeleted();
 
   // ImportantFileWriter::DataSerializer
-  virtual bool SerializeData(std::string* output);
+  virtual bool SerializeData(std::string* output) OVERRIDE;
 
  private:
   friend class base::RefCountedThreadSafe<BookmarkStorage>;
@@ -140,7 +140,7 @@ class BookmarkStorage : public content::NotificationObserver,
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   // Serializes the data and schedules save using ImportantFileWriter.
   // Returns true on successful serialization.