[speleding]

Lots of sites use Google's CDN so it's very likely the file is already in your user's cache. That seems like a nice little speed bonus if the only trade off is the theoretical risk that Google's CDN might be more easily hacked than your own server.

As an aside, I notice on my site there are a few precent of visitors with security settings on their browser that prevent loading from Google's CDN (actually, there's usually an internet security product of some sort interfering). So you're going to have to provide a fallback to a file on your own server anyway.