NS_WARN_IF_FALSE(PR_FALSE, "Not Implemented");
*aTreeOwner = mTreeOwner; NS_IF_ADDREF(*aTreeOwner);
NS_IMETHODIMP nsWebShell::GetTreeOwner(nsIDocShellTreeOwner** aTreeOwner){   NS_ENSURE_ARG_POINTER(aTreeOwner);   //XXXIMPL Implement this!   NS_WARN_IF_FALSE(PR_FALSE, "Not Implemented");   return NS_OK;}