Re: [ServiceWorker] window.caches and window.fetch should be [Replaceable] (#535)

BTW, it seems `[Replaceable]` is defined only for attributes. Maybe `[Unforgeable]` is the right extended attribute to discuss? Operations don't have it by default, and so the current spec allows overwriting window.fetch on both objects and their prototype objects?

I find `[Unforgeable]` in some part of ServiceWorker IDLs. Is there any trend to use it for newly introduced APIs?

(Copied from blink-dev https://groups.google.com/a/chromium.org/d/msg/blink-dev/qwRO52vsQlU/5YzMNwThrjoJ)

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