I recently reconnected with an old friend on Facebook.
I think the trouble is at the decision point of your friend's situation, nobody knew, or could have told her with any reasonably certainty what the outcome of resuscitation would be. What the extent of his brain damage would be, even if they knew he'd have at least some. For me, and I'm pro-choice, I would probably have given the green light on CPR unless they had told me "he's going to be severely disabled for sure".
But in the case where you do know, I would also let him go. But then, there's a big difference between witholding resuscitation and ending a pregnancy.