Add OVERRIDE to chrome/browser/.

chrome/browser/repost_form_warning_controller.h

Index: chrome/browser/repost_form_warning_controller.h
diff --git a/chrome/browser/repost_form_warning_controller.h b/chrome/browser/repost_form_warning_controller.h
index a6185383640dafc37ddaa20a12c684b9c2a33662..7b8114ac4a7b76eb1bf37d75afad54fdcf3ec078 100644
--- a/chrome/browser/repost_form_warning_controller.h
+++ b/chrome/browser/repost_form_warning_controller.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_REPOST_FORM_WARNING_CONTROLLER_H_
 #pragma once
 
+#include "base/compiler_specific.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
@@ -33,7 +34,7 @@ class RepostFormWarningController : public content::NotificationObserver {
   // Watch for a new load or a closed tab and dismiss the dialog if they occur.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   // Close the warning dialog.
   void CloseDialog();