EnsureDocShell();
*aDocShell = nsnull;  nsresult rv = EnsureDocShell(); NS_ENSURE_SUCCESS(rv, rv);
nsFrameLoader::GetDocShell(nsIDocShell **aDocShell){  EnsureDocShell();  *aDocShell = mDocShell;  NS_IF_ADDREF(*aDocShell);  return NS_OK;}