[whatwg/fetch] Add HTTP whitespace back for MIME types (#828)

See https://github.com/whatwg/mimesniff/pull/90.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/828

-- Commit Summary --

  * Add HTTP whitespace back for MIME types

-- File Changes --

    M fetch.bs (7)

-- Patch Links --

https://github.com/whatwg/fetch/pull/828.patch
https://github.com/whatwg/fetch/pull/828.diff

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