Sounds a bit unusual, but not unfair - Google just preemptively paid all of the damages that the government was seeking in this particular case, which is the only thing the jury would have been needed to determine. So having a jury would be a complete waste of the jury's time. The rest of the case would be up to the judge anyway.
If the prosecutor thinks they could get more now maybe they should have asked for more earlier. I think this may have been a miscalculation on the prosecution's side.