Google says it's closed Fitbit deal despite ongoing Department of Justice review

Unusual, but not unprecedented. That's how antitrust experts described Google's surprising announcement Thursday that it had closed its $2.1 billion acquisition of Fitbit — and the even more surprising announcement from U.S. regulators that, no, they haven't yet completed their review of the deal and could still pursue enforcement, thank you very much. So what gives? Google said it crossed all the T's and dotted all the I's after the waiting period under the Hart-Scott-Rodino Antitrust Improvements…