[whatwg/xhr] Limit Content-Type overrides to when charset isn't already UTF-8 (#224)

This will help web compatibility and address all cases linked from https://github.com/whatwg/mimesniff/issues/84.

Tests: ...
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/224

-- Commit Summary --

  * Limit Content-Type overrides to when charset isn't already UTF-8

-- File Changes --

    M xhr.bs (6)

-- Patch Links --

https://github.com/whatwg/xhr/pull/224.patch
https://github.com/whatwg/xhr/pull/224.diff

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https://github.com/whatwg/xhr/pull/224