nsXULPrototypeDocument::GetHeaderData(nsIAtom* aField, nsString& aData) const
nsXULPrototypeDocument::GetHeaderData(nsIAtom* aField, nsAWritableString& aData) const
nsXULPrototypeDocument::GetHeaderData(nsIAtom* aField, nsString& aData) const{    // XXX Not implemented    aData.Truncate();    return NS_OK;}