GetParent((nsIFrame**)&parent);  nsIContent* content; nsresult    rv = parent->GetContent(&content); aContent = content;
nsresult rv = GetParent((nsIFrame**)&parent); if (NS_SUCCEEDED(rv) && parent) { rv = parent->GetContent(&aContent); }
nsHTMLFrameInnerFrame::GetParentContent(nsIContent*& aContent){  nsHTMLFrameOuterFrame* parent;  GetParent((nsIFrame**)&parent);  nsIContent* content;  nsresult    rv = parent->GetContent(&content);  aContent = content;  return rv;}