Looks like the error codes issued by python's http library might vary
between versions/distros. The code tries to reach an URL which is only valid
inside GCE and in the event of getting an error it assumes the user is
a non-googler.

At least in this case, we're seeing:

  third_party.httplib2.socks.HTTPError: (404, 'No such domain')

Adding this exception type allows the function to work correctly.

Change-Id: I08d3656b25d9046f8b2fc0da2a2b7c7a698c1d92
Reviewed-on: https://chromium-review.googlesource.com/978212
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>