Add OVERRIDE to chrome/browser/.

chrome/browser/background/background_contents_service.h

Index: chrome/browser/background/background_contents_service.h
diff --git a/chrome/browser/background/background_contents_service.h b/chrome/browser/background/background_contents_service.h
index 71434183ff3d2e11801efbbaec62e0d0148e1fb1..14adadc0e7b64073dc2400cd243f837aa544c48d 100644
--- a/chrome/browser/background/background_contents_service.h
+++ b/chrome/browser/background/background_contents_service.h
@@ -62,7 +62,7 @@ class BackgroundContentsService : private content::NotificationObserver,
   virtual void AddTabContents(TabContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
-                              bool user_gesture);
+                              bool user_gesture) OVERRIDE;
 
   // Gets the parent application id for the passed BackgroundContents. Returns
   // an empty string if no parent application found (e.g. passed
@@ -108,7 +108,7 @@ class BackgroundContentsService : private content::NotificationObserver,
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   // Loads all registered BackgroundContents at startup.
   void LoadBackgroundContentsFromPrefs(Profile* profile);