The Google Client SDK does an awful lot of stuff. In order to do them all in an efficient way it shares code. It's definitely the case that if you only want t

The Google Client SDK does an awful lot of stuff. In order to do them all in an efficient way it shares code. It's definitely the case that if you only want the one call out of the whole thing then you could get by with only a small chunk of that code, but writing the Client SDK so that each feature was entirely independent would be a lot more work for them. So they make their lives easier, and you get to have an extra 37MB of code on your client.