function callback(error, selectorPayload)
        {
            if (error || !selectorPayload)
                return null;
            this._cssModel._domModel.markUndoableState();
            this._cssModel._fireStyleSheetChanged(/** @type {string} */(this.styleSheetId));
            return WebInspector.CSSRuleSelector.parseSelectorListPayload(selectorPayload);
        }
@param {?Protocol.Error} error
@param {?CSSAgent.SelectorList} selectorPayload
@return {?Array.<!WebInspector.CSSRuleSelector>}
@this {WebInspector.CSSRule}