mChildSheetCount = mSheet->StyleSheetCount();
CSSParserImpl::CSSParserImpl(nsICSSStyleSheet* aSheet){  NS_INIT_REFCNT();  nsCSSAtoms::AddrefAtoms();  mScanner = nsnull;  mSheet = aSheet; NS_ADDREF(aSheet);  mHavePushBack = PR_FALSE;  mNavQuirkMode = PR_TRUE;  mCaseSensitive = PR_FALSE;}