if (mRuleProcessors) { mRuleProcessors->EnumerateForwards(EnumClearRuleCascades, nsnull);
if (mMediumCascadeTable) { mMediumCascadeTable->Enumerate(DeleteRuleCascade, nsnull); delete mMediumCascadeTable; mMediumCascadeTable = nsnull;
CSSStyleSheetImpl::ClearRuleCascades(void){  if (mRuleProcessors) {    mRuleProcessors->EnumerateForwards(EnumClearRuleCascades, nsnull);  }  if (mParent) {    CSSStyleSheetImpl* parent = (CSSStyleSheetImpl*)mParent;    parent->ClearRuleCascades();  }}