Abort bandwidth test on page unload
Abort bandwidth test on page unload

It's possible for the bandwidth test to run for a long time, and the
user may leave the page while it's running.  If this happens, abort the
test and send the beacon immediately.

lognormal/boomerang,FredXue/boomerang,forcedotcom/kylie,sdgdsffdsfff/boomerang,FredXue/boomerang,lognormal/boomerang,levexis/boomerang,forcedotcom/kylie,sdgdsffdsfff/boomerang,levexis/boomerang