[whatwg/xhr] Stop using "combined value" (#229)

Header list's get is much nicer.

See https://github.com/whatwg/fetch/pull/840 for context.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/229

-- Commit Summary --

  * Stop using "combined value"

-- File Changes --

    M xhr.bs (21)

-- Patch Links --

https://github.com/whatwg/xhr/pull/229.patch
https://github.com/whatwg/xhr/pull/229.diff

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