NS_IMETHODIMP nsPref::ClearUserPref(const char *aPrefName)
NS_IMETHODIMP nsPref::ClearUserPref(const char *pref_name)
NS_IMETHODIMP nsPref::ClearUserPref(const char *aPrefName){  nsresult rv;  nsCOMPtr<nsIPrefBranch> prefBranch = do_QueryInterface(mPrefService, &rv);  if (NS_SUCCEEDED(rv))    rv = prefBranch->ClearUserPref(aPrefName);  return rv;}