[whatwg/fetch] Remove location URL as field on responses (#1149)

It does not need to be stored on a response and therefore resulted in confusion.

Also clarify that synthetic responses need to have an absolute URL in the Location header field value (Response.redirect() does this automatically).

Corresponding HTML PR: TODO.

Tests: TODO.

Closes #631, closes #633, closes #958, and closes #1146. (Some of these can be closed due to #1030 making response's URL no longer null for network responses.)

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1149


-- Commit Summary --

  * Remove location URL as field on responses

-- File Changes --

    M fetch.bs (87)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1149.patch

https://github.com/whatwg/fetch/pull/1149.diff


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