Re: [whatwg/fetch] Consider splitting `document` into `document` and `nested-document`. (#755)

I am not totally clear about the intent of this change.
Is it to allow a simpler definition/implementation of Sec-Metadata?
Is it to allow service worker to start acting as some sort of security proxy that could decide to stop loads based on a better knowledge of the client triggering the fetch?

FWIW, WebKit has this is-top-level-navigation concept, although at a slightly lower level. The proposed change seems ok from that prospective.
The same information could be made available elsewhere in a backward compatible way: fetch event or service worker client for instance.

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