frameManager->GetInsertionPoint(aShell, aFrame, child, aResult);
styleSet->GetInsertionPoint(aShell, aFrame, child, aResult);
static void GetInsertionPoint(nsIPresShell* aShell, nsIFrame* aFrame, nsIFrame* aChild,                              nsIFrame** aResult){  nsCOMPtr<nsIFrameManager> frameManager;  aShell->GetFrameManager(getter_AddRefs(frameManager));  nsCOMPtr<nsIContent> child;  if (aChild)    aChild->GetContent(getter_AddRefs(child));  frameManager->GetInsertionPoint(aShell, aFrame, child, aResult);}