[whatwg/xhr] Handle errors in response bodies (#315)

And also clean up the way we manage XMLHttpRequest's response, which allows for simplifying "handle response end-of-body" and "handle errors".

Tests: https://github.com/web-platform-tests/wpt/pull/27778.


Fixes #314.

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<a href="https://whatpr.org/xhr/315.html" title="Last updated on Feb 26, 2021, 2:16 PM UTC (2a60fc0)">Preview</a> | <a href="https://whatpr.org/xhr/315/26f974f...2a60fc0.html" title="Last updated on Feb 26, 2021, 2:16 PM UTC (2a60fc0)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/315


-- Commit Summary --

  * Handle errors in response bodies

-- File Changes --

    M xhr.bs (63)

-- Patch Links --

https://github.com/whatwg/xhr/pull/315.patch

https://github.com/whatwg/xhr/pull/315.diff


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