Re: [w3c/ServiceWorker] "if client is an environment" is always true (#1045)

I tend to agree with @isonmad. E.g., we use something like "if _X_ is an element" fairly often in DOM and it needs to be true even if _X_ is a subclass of `Element`. At some point we'll formalize this through brands: https://github.com/heycam/webidl/issues/97.

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