Add OVERRIDE to chrome/browser/.

chrome/browser/omnibox_search_hint.h

Index: chrome/browser/omnibox_search_hint.h
diff --git a/chrome/browser/omnibox_search_hint.h b/chrome/browser/omnibox_search_hint.h
index 575373682987597fc6839cb1b87455aff44c771a..348abf21988893dff26b86921d5acb9269fc85fc 100644
--- a/chrome/browser/omnibox_search_hint.h
+++ b/chrome/browser/omnibox_search_hint.h
@@ -9,6 +9,7 @@
 #include <map>
 #include <string>
 
+#include "base/compiler_specific.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
@@ -28,7 +29,7 @@ class OmniboxSearchHint : public content::NotificationObserver {
   // content::NotificationObserver method:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   // Focus the location bar and displays a message instructing that search
   // queries can be typed directly in there.