[whatwg/xhr] Use HTML's parse a URL (Issue #380)

As https://wpt.fyi/results/html/infrastructure/urls/resolving-urls/query-encoding/windows-1251.html%3Finclude%3Dxhr and surrounding tests indicate all implementations are aligned on not always using UTF-8 as the URL encoding. Given this is an old API it's probably better to standardize on that and change the test expectations.

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