On the whole I don't think this is evil. More of a lateral move, morally.
I can't imagine what Google hopes to accomplish with this since Flash is currently circling the drain, relevancy-wise, but if it does anything to hasten the move away from using Flash at all, then it's a plus.
So Google is not evil because forcing Adobe to remove flash support from other 'vendors' browsers is actually a good thing? Basically Google knows best and anyone who thinks that they might actually want to continue to use flash on Linux in a non-Google browser (or at least without installing Chrome) is wrong?
This looks like the sort of heavy-handed monopoly activity that made Microsoft so great.
It's possible that Adobe were intending to cease all Linux-based browser support and Google prevented that by buying back Chrome support; in which case Google has slipped in their PR big time.
I can't imagine what Google hopes to accomplish with this since Flash is currently circling the drain, relevancy-wise, but if it does anything to hasten the move away from using Flash at all, then it's a plus.