function navigate(url, clients) {
        return _send(
            {
                method: "Page.navigate",
                params: {
                    url: url
                }
            },
            clients
        );
    }
Protocol method. Navigates current page to the given URL.
@param {number|Array.<number>} clients A client ID or array of client IDs that should navigate to the given URL.
@param {string} url URL to navigate the page to.
@return {$.Promise} A promise that's resolved with the return value from the first client that responds
     to the method.