[whatwg/xhr] Use new Streams algorithms (#292)

Follows https://github.com/whatwg/streams/pull/1073.


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<a href="https://whatpr.org/xhr/292.html" title="Last updated on Sep 29, 2020, 4:57 PM UTC (aebcaa2)">Preview</a> | <a href="https://whatpr.org/xhr/292/59eb1d9...aebcaa2.html" title="Last updated on Sep 29, 2020, 4:57 PM UTC (aebcaa2)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/292

-- Commit Summary --

  * Use new Streams algorithms

-- File Changes --

    M xhr.bs (81)

-- Patch Links --

https://github.com/whatwg/xhr/pull/292.patch
https://github.com/whatwg/xhr/pull/292.diff

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