Re: [whatwg/dom] Standardize certain Microsoft event extensions (#334)

In Chrome at least Event's returnValue is a Web IDL boolean, so setting it to 0 and null should be the same as setting it to false.

It sounds like your proposing one of the following deltas from the current specs:

1. Add returnValue as a boolean to Event, so that setting it to false (or something that converts to false) cancels the event.
2. (1), but also:
   - Remove returnValue as a DOMString from BeforeUnloadEvent, making it an empty interface
   - Remove the setting of `e.returnValue` to the return value of `onbeforeunload` event handlers in https://html.spec.whatwg.org/#the-event-handler-processing-algorithm step 4
   - Remove the checking of `e.returnValue` in https://html.spec.whatwg.org/#unloading-documents:dom-beforeunloadevent-returnvalue (thus relying entirely on the checking of cancelation)
3. (2), but also remove the BeforeUnloadEvent interface entirely

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