nsComputedDOMStyle::GetPropertyPriority(const nsString& aPropertyName, nsString& aReturn)
nsComputedDOMStyle::GetPropertyPriority(const nsAString& aPropertyName, nsAString& aReturn)
nsComputedDOMStyle::GetPropertyPriority(const nsString& aPropertyName,                                        nsString& aReturn){  aReturn.Truncate();  return NS_OK;}