[whatwg/fetch] Make combined value and sort and combine work for XMLHttpRequest (#502)

See https://github.com/whatwg/xhr/issues/109.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/502

-- Commit Summary --

  * Make combined value and sort and combine work for XMLHttpRequest

-- File Changes --

    M fetch.bs (26)

-- Patch Links --

https://github.com/whatwg/fetch/pull/502.patch
https://github.com/whatwg/fetch/pull/502.diff

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