function onMatchingSelectors(selectors, matchingSelectors)
        {
            if (!matchingSelectors)
                return false;
            this.selectors = selectors;
            this.matchingSelectors = matchingSelectors;
            return true;
        }
@param {!Array<!WebInspector.CSSRuleSelector>} selectors
@param {?Array<number>} matchingSelectors
@return {boolean}
@this {WebInspector.CSSRule}