MOZ_COUNT_CTOR(StyleSetImpl);
StyleSetImpl::StyleSetImpl()  : mOverrideSheets(nsnull),    mDocSheets(nsnull),    mBackstopSheets(nsnull),    mRuleProcessors(nsnull),    mRecycler(nsnull),    mFrameConstructor(nsnull){  MOZ_COUNT_CTOR(StyleSetImpl);  NS_INIT_REFCNT();}