if (mParent) { CSSStyleSheetImpl* parent = (CSSStyleSheetImpl*)mParent; parent->ClearRuleCascades(); }
return NS_OK;
CSSStyleSheetImpl::ClearRuleCascades(void){  if (mRuleProcessors) {    mRuleProcessors->EnumerateForwards(EnumClearRuleCascades, nsnull);  }  if (mParent) {    CSSStyleSheetImpl* parent = (CSSStyleSheetImpl*)mParent;    parent->ClearRuleCascades();  }}