[whatwg/fetch] Preserve HEAD method on 303 redirect (#796)

Tests: already tested by fetch/api/redirect/redirect-method.any.js.

Fixes #753.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/796

-- Commit Summary --

  * Preserve HEAD method on 303 redirect

-- File Changes --

    M fetch.bs (19)

-- Patch Links --

https://github.com/whatwg/fetch/pull/796.patch
https://github.com/whatwg/fetch/pull/796.diff

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