I did check, and it's covered in the Official Baseball Rules, Rule 9.17(c)
Varland's 1/3 inning facing 2 batters pretty much fits this description, so the Official Scorer gets no choice but to award the Win to the guy, Hoffman, who otherwise would have gotten the Save. That's a different kind of Vultured win than we usually think of, since Hoffman totally did his job.
Sorry for the tangent to the actual purpose of this thread. Hopefully someone besides just me finds it interesting.