*aNewFrame = new (aPresShell) nsXTFXMLInlineDisplayFrame();  if (nsnull == *aNewFrame) return NS_ERROR_OUT_OF_MEMORY;  return NS_OK;
return new (aPresShell) nsXTFXMLInlineDisplayFrame();
NS_NewXTFXMLDisplayFrame(nsIPresShell* aPresShell, PRBool isBlock, nsIFrame** aNewFrame){  if (isBlock)    *aNewFrame = new (aPresShell) nsXTFXMLBlockDisplayFrame();  else    *aNewFrame = new (aPresShell) nsXTFXMLInlineDisplayFrame();    if (nsnull == *aNewFrame)    return NS_ERROR_OUT_OF_MEMORY;  return NS_OK;}