I'm pretty sure that the contest is hosted by the University of Waterloo's Computer Science Club; Google is a sponsor, UofT is definitely not a host -- http://aichallenge.org/faq.php
We are no longer directly connected with University of Waterloo's CSC and have never been affiliated with UofT. There are a few current and past UofW students that are still admins in the contest but also a few others that have stepped up from around the world to help put it together it.