[whatwg/fetch] Using fetch in other standards (#1314)

Closes #1306.

@tabatkins @ricea @yutakahirano care to review?


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### :boom: Error: 500 Internal Server Error :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Sep 29, 2021, 10:41 AM UTC)_.

<details>
<summary>More</summary>


PR Preview relies on a number of web services to run. There seems to be an issue with the following one:

:rotating_light: [CSS Spec Preprocessor](https://api.csswg.org/bikeshed/) - CSS Spec Preprocessor is the web service used to build Bikeshed specs.

:link: [Related URL](https://api.csswg.org/bikeshed/?url=https%3A%2F%2Fraw.githubusercontent.com%2Fwhatwg%2Ffetch%2F9a6951fabe1531d94c1088ec8c6484e6a3d2e981%2Ffetch.bs&force=1&md-status=LS-PR&md-Text-Macro=PR-NUMBER%201314)



_If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20whatwg/fetch%231314.)._
</details>

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

  https://github.com/whatwg/fetch/pull/1314

-- Commit Summary --

  * <a href="https://github.com/whatwg/fetch/pull/1314/commits/9a6951fabe1531d94c1088ec8c6484e6a3d2e981">Using fetch in other standards</a>

-- File Changes --

    M fetch.bs (56)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1314.patch
https://github.com/whatwg/fetch/pull/1314.diff

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