Add OVERRIDE to chrome/browser/chromeos/.

chrome/browser/chromeos/locale_change_guard.h

Index: chrome/browser/chromeos/locale_change_guard.h
diff --git a/chrome/browser/chromeos/locale_change_guard.h b/chrome/browser/chromeos/locale_change_guard.h
index d3f19aeea7834aa5d74959083aecb694e623cd50..2c9ac6e5fd8beff1d67772b21225ab033f842f05 100644
--- a/chrome/browser/chromeos/locale_change_guard.h
+++ b/chrome/browser/chromeos/locale_change_guard.h
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ -50,7 +51,7 @@ class LocaleChangeGuard : public content::NotificationObserver,
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   std::string from_locale_;
   std::string to_locale_;