[whatwg/xhr] overrideMimeType does not throw for invalid input (#125)

Implementations vary quite significantly in how they deal with invalid
input though (or lack of input).

Tests: https://github.com/w3c/web-platform-tests/pull/4955 and
https://github.com/w3c/web-platform-tests/pull/4993.

Fixes #82.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/125

-- Commit Summary --

  * overrideMimeType does not throw for invalid input

-- File Changes --

    M xhr.bs (56)

-- Patch Links --

https://github.com/whatwg/xhr/pull/125.patch
https://github.com/whatwg/xhr/pull/125.diff

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