Re: [slightlyoff/ServiceWorker] Remove frameType, maybe add ancestorOrigins (#732)

Yes, that security check is important for `Location` objects. Is a `WindowClient` always same-origin?

I think you basically want to make the computation of this array reusable https://html.spec.whatwg.org/multipage/browsers.html#concept-location-ancestor-origins-array and not bother with `ancestorOrigins` itself (that you'd just define to return such an array).

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