Re: [whatwg/dom] window.event and shadow trees (#679)

@yuki3 the rationale is that if an event listener in a shadow tree calls a "global function", that global function then has access to the shadow tree through `window.event`, breaking encapsulation.

Technically this applies to composed events as well, however in that case the global function could have obtained a reference to the `Event` object earlier on easily enough as well.

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