NS_IMETHODIMP nsPref::Observe(nsISupports *aSubject, const PRUnichar *aTopic, const PRUnichar *someData)
NS_IMETHODIMP nsPref::Observe(nsISupports *aSubject, const char *aTopic, const PRUnichar *someData)
NS_IMETHODIMP nsPref::Observe(nsISupports *aSubject, const PRUnichar *aTopic, const PRUnichar *someData){  nsresult rv;  nsCOMPtr<nsIObserver> observer = do_QueryInterface(mPrefService, &rv);  if (NS_SUCCEEDED(rv))    rv = observer->Observe(aSubject, aTopic, someData);  return rv;}