[whatwg/xhr] Define MIME type extraction better (#131)

Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=23632.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/131

-- Commit Summary --

  * Define MIME type extraction better

-- File Changes --

    M xhr.bs (27)

-- Patch Links --

https://github.com/whatwg/xhr/pull/131.patch
https://github.com/whatwg/xhr/pull/131.diff

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https://github.com/whatwg/xhr/pull/131