PRInt32& aHint) const
nsChangeHint& aHint) const
nsHTMLBRElement::GetMappedAttributeImpact(const nsIAtom* aAttribute, PRInt32 aModType,                                          PRInt32& aHint) const{  if (!GetCommonMappedAttributesImpact(aAttribute, aHint)) {    if (nsHTMLAtoms::clear == aAttribute) {      aHint = NS_STYLE_HINT_REFLOW;    }    else {      aHint = NS_STYLE_HINT_CONTENT;    }  }  return NS_OK;}