aContent->GetParent(*getter_AddRefs(parent));
aContent->GetParent(getter_AddRefs(parent));
FrameManager::GetUndisplayedContent(nsIContent* aContent){  if (!aContent || !mUndisplayedMap)    return nsnull;  nsCOMPtr<nsIContent> parent;  aContent->GetParent(*getter_AddRefs(parent));  if (!parent)    return nsnull;  for (UndisplayedNode* node = mUndisplayedMap->GetFirstNode(parent);         node; node = node->mNext) {    if (node->mContent == aContent)      return node->mStyle;  }  return nsnull;}