NS_NewXTFXMLDisplayFrame(nsIPresShell* aPresShell, PRBool isBlock, nsIFrame** aNewFrame)
NS_NewXTFXMLDisplayFrame(nsIPresShell* aPresShell, PRBool isBlock)
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;}