NS_IF_ADDREF(provider);
nsSVGOuterSVGFrame::GetCoordContextProvider(){  NS_ASSERTION(mContent, "null parent");  // Our <svg> content element is the CoordContextProvider for our children:  nsSVGCoordCtxProvider *provider;  mContent->QueryInterface(NS_GET_IID(nsSVGCoordCtxProvider), (void**)&provider);  NS_IF_ADDREF(provider);    return provider;  }