I use the Wordfence plugin on my WordPress sites for extra security. Generally it’s great, but it can be a bit over-sensitive (granted, it’s best to err in this direction with security!).
Anyway, however dangerous (or not) this site is, the URL in the JS file is utterly harmless – it’s in a comment. Furthermore, the URL is only in the dev version of the script. Only the minified version – stripped of comments – actually gets used on live sites.
I’ve removed this URL from the latest version of the plugin on GitHub, but it might be a little while before it gets rolled out on wordpress.org. Until then, please ignore this issue if Wordfence flags it up for you.