Re: [whatwg/dom] Define a 'CancellationController' and 'CancellationSignal' interface. (#434)

(As an aside, I don't think we should reuse "AbortError" DOMException even if we decided not to care about cross-realm branding, since that is already used by APIs and it's not clear they all use it with the semantics we are going for here.)

@ljharb I would like to know why we should care about branding for this particular feature. It's not entirely clear to me why ECMAScript cares about it for arrays, but not all its other objects. (I might have known at some point, but I forgot.) Most platform objects don't have this kind of branding exposed either (although there's some browser engineers who think we should do that).

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