Why did the team deliberate so much?
I will let the readers ponder this.
There are already some very good stub resolvers and resolver libraries available to users (e.g. dnsqr and the djbdns library). I have a hard time believing Google is going to do better than djb.
Of course I have no problem with them or anyone else writing another one. Have at it. The more attention brought to name resolution the better -- because it can be so easily abused for questionable purposes, it is something that deserves user oversight.
But why does Google need to place theirs _inside the browser_? That is a very curious design decision.