That appears to require Google's asynchronous Analytics tracking code, which is not what our GA tracking code uses. If you want to use that, you'd need to remove our version of the GA tracking code from your pages and implement GA's async code yourself, which would be entirely up to you to sort out on your own. Doing so would remove functionality built into our version of the GA code and our cart, such as the ability to track cart button clicks and pick up Ecommerce Tracking data from the thank-you pages we generate for you.