nsCOMPtr<nsIObserverService> os = do_GetService(NS_OBSERVERSERVICE_CONTRACTID); if (os) os->AddObserver(this, NS_MEMORY_PRESSURE_TOPIC);
nsStringBundleService::Init(){  nsCOMPtr<nsIObserverService> os = do_GetService(NS_OBSERVERSERVICE_CONTRACTID);  if (os)    os->AddObserver(this, NS_MEMORY_PRESSURE_TOPIC);  return NS_OK;}