Yes, Google have said they will not fix this. If you are going to go as far as the monkeypatch you may as well just republish the game from a new C2 build (there are lots of other useful compatibility fixes for others browsers like IE11, Firefox, Safari etc).
Hopefully this will not happen again since the new policy is not to vendor-prefix features - they tend to be hidden behind flags instead until they are fully standardised and ready.