[whatwg/fetch] Remove "foreign" service-workers mode (#596)

Fixes part of https://github.com/w3c/ServiceWorker/issues/1188.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/596

-- Commit Summary --

  * Remove "foreign" service-workers mode

-- File Changes --

    M fetch.bs (41)

-- Patch Links --

https://github.com/whatwg/fetch/pull/596.patch
https://github.com/whatwg/fetch/pull/596.diff

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