Site doesn't run if you have WebVR Emulator extension installed

[Jeff Nusz]

@puckey suggested wrapping a try/catch around the code that's breaking in VRControl, but I don't have way of testing at the moment. It only happens on sites that have a valid Origin Token, and the only sites that do are staging and master, and I don't want to push my changes until I know it's working. I've requested a new origin token for a testing URL we can use.