nsMathMLmtdFrame* it = new nsMathMLmtdFrame;
nsMathMLmtdFrame* it = new (aPresShell) nsMathMLmtdFrame;
NS_NewMathMLmtdFrame(nsIFrame** aNewFrame){  NS_PRECONDITION(aNewFrame, "null OUT ptr");  if (nsnull == aNewFrame) {    return NS_ERROR_NULL_POINTER;  }  nsMathMLmtdFrame* it = new nsMathMLmtdFrame;  if (nsnull == it) {    return NS_ERROR_OUT_OF_MEMORY;  }// XXX RBS -  what about mFlags ?// it->SetFlags(NS_AREA_WRAP_SIZE); ?  *aNewFrame = it;  return NS_OK;}