[whatwg/xhr] Define Content-Type manipulation in terms of MIME Sniffing (#176)

Note that this also replaces "utf-8" with "UTF-8" and no longer preserves duplicate parameters.

Tests: https://github.com/w3c/web-platform-tests/pull/8422.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/176

-- Commit Summary --

  * Define Content-Type manipulation in terms of MIME Sniffing

-- File Changes --

    M xhr.bs (36)

-- Patch Links --

https://github.com/whatwg/xhr/pull/176.patch
https://github.com/whatwg/xhr/pull/176.diff

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