if (mDeclaration) mDeclaration->AddRef();
mDeclaration->AddRef();
CSSStyleRuleImpl::CSSStyleRuleImpl(nsCSSSelectorList* aSelector,                                   nsCSSDeclaration* aDeclaration)  : nsCSSRule(),    mSelector(aSelector),    mDeclaration(aDeclaration),     mImportantRule(nsnull),    mDOMRule(nsnull){  if (mDeclaration)    mDeclaration->AddRef();}