[whatwg/dom] Introduce abortSignal.throwIfAborted() (PR #1034)

Closes #927.

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   * @josepharhar would you be interested in implementing this for Chromium? It should be pretty easy; the hardest part will just be writing a few web platform tests...
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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1034


-- Commit Summary --

  * Introduce abortSignal.throwIfAborted()

-- File Changes --

    M dom.bs (35)

-- Patch Links --

https://github.com/whatwg/dom/pull/1034.patch

https://github.com/whatwg/dom/pull/1034.diff


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