[whatwg/fetch] Integrate CORP and COEP (#1030)

This is part of the introduction of COEP
(https://github.com/whatwg/html/pull/5454). The CORP check now takes
COEP into account. Also, responses coming from service workers
are checked.


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### :boom: Error: 400 Bad Request :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Jun 1, 2020, 9:59 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%2F809385a0fd575d928dab97592dd590a5612f6027%2Ffetch.bs&force=1&md-status=LS-PR&md-Text-Macro=PR-NUMBER%201030)



_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%231030.)._
</details>

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

  https://github.com/whatwg/fetch/pull/1030

-- Commit Summary --

  * Integrate CORP and COEP

-- File Changes --

    M fetch.bs (148)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1030.patch
https://github.com/whatwg/fetch/pull/1030.diff

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