return NS_OK;
if (mParent) { CSSStyleSheetImpl* parent = (CSSStyleSheetImpl*)mParent; parent->ClearRuleCascades(); }
CSSRuleProcessor::ClearRuleCascades(void){  if (mMediumCascadeTable) {    mMediumCascadeTable->Enumerate(DeleteRuleCascade, nsnull);    delete mMediumCascadeTable;    mMediumCascadeTable = nsnull;  }  return NS_OK;}