Add OVERRIDE to chrome/browser/chromeos/.

chrome/browser/chromeos/login/ownership_service.h

Index: chrome/browser/chromeos/login/ownership_service.h
diff --git a/chrome/browser/chromeos/login/ownership_service.h b/chrome/browser/chromeos/login/ownership_service.h
index 52a3d77e36e8a9c35a33a8e2dbe640eec71d9c79..989f59758fed97e93883c8668ae6b54b0e0c3479 100644
--- a/chrome/browser/chromeos/login/ownership_service.h
+++ b/chrome/browser/chromeos/login/ownership_service.h
@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "base/callback.h"
+#include "base/compiler_specific.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/chromeos/login/owner_key_utils.h"
 #include "chrome/browser/chromeos/login/owner_manager.h"
@@ -104,7 +105,7 @@ class OwnershipService : public content::NotificationObserver {
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
  private:
   friend struct base::DefaultLazyInstanceTraits<OwnershipService>;