[whatwg/xhr] Look at overrideMimeType() again (#157)

There's a test that checks that `text/xml;charset=†` is rejected and Chrome has implemented this, but I don't think any other part of the platform reuses that check. What we end up doing is ignoring non-ASCII bytes in MIME types. So we should rewrite `XMLHttpRequest/overridemimetype-blob.html` and maybe change the requirements in the specification.

This ties into the ever growing https://github.com/whatwg/mimesniff/issues/30.

See https://bugzilla.mozilla.org/show_bug.cgi?id=918731 for more background.

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