[whatwg/dom] Should a Range object be able to update a Selection object (#772)

https://mozilla.pettay.fi/moztests/selection_dynamic.html demonstrates that in Chrome and Firefox you can update a `Selection` object through a `Range` object. Safari does not support this (and is in line with the DOM Standard as `Range` objects do not have that capability in theory).

cc @rniwa @smaug---- @foolip @tkent-google 

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