Heh, since Google is famous (infamous?) for saying most products are small teams, just 3 or 4 people. It sounds like they are working all by themselves :-)
That being said, given all the products that had to co-operate somewhat for this to be released I doubt they were 'small'.
It depends what you consider a team. The "Chrome" team is big, but the team that works on the HTML5 parser within Chrome is pretty tiny, as is the team responsible for V8, as are many of the other teams.
That being said, given all the products that had to co-operate somewhat for this to be released I doubt they were 'small'.