Yes—in the sense that they told everyone over a year ago that they were mothballing Google Code[1]. So yes, it's "down", permanently.

At some point, people may start rediscovering that you want everything to reproduce the build in source control, but I've kind of given up on that. Git made it infeasible and we retconned that into vendoring being bad.

[1] http://google-opensource.blogspot.com/2015/03/farewell-to-go...

Can you go into more detail on why Git made it infeasible to include everything necessary to reproduce the build in source control?

Thanks for the heads up -- didn't realize.

Is there any good reason your website should be dependent on this URL, rather than including the JS files on your own server?

Laziness, I guess. Duly noted.

A subversion server is not a CDN.