nsIContent* aContent2)
nsIContent* aContent2, nsIAtom* aChangedPseudoClass)
PresShell::ContentStatesChanged(nsIDocument* aDocument,                                nsIContent* aContent1,                                nsIContent* aContent2){  WillCauseReflow();  nsresult rv = mStyleSet->ContentStatesChanged(mPresContext, aContent1, aContent2);  VERIFY_STYLE_TREE;  DidCauseReflow();  return rv;}