Steer straight
do NOT hit front brake
Initially let friction slow you down
Pray to God
look for places to crash that will do a minimum of damage
I would probably add, as a purely instinctive reaction; since one would be crouched forward on a scooter at such speeds; sit as upright as you can while still maintaining a good grip on the handlebars. This would move the CG back a bit, reducing weight on the front rim, and allowing your body to act as an airbrake.