[whatwg/dom] document.createEvent() should maybe not be conditional upon exposure (#952)

Apparently `TouchEvent` is always exposed in Chrome, but `document.createEvent("touchevent")` depends on the "touch events flag" (see https://github.com/w3c/touch-events/issues/64). Having said that, neither Firefox nor Safari expose `TouchEvent` so maybe Chrome should change?

cc @patrickhlauke @RByers 

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