[whatwg/fetch] Remove HTTPS state concept (#1067)

Part of #1062. Closes #270.

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- [x] At least two implementers are interested (and none opposed):
   * All implementers do not use the HTTPS state concept. Apparently Chrome did at one time, but I checked and we're OK removing it.
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * This isn't really testable, I don't think?
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/master/MAINTAINERS.md#handling-pull-requests) are filed:
   * N/A

(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/fetch/pull/1067

-- Commit Summary --

  * Remove HTTPS state concept

-- File Changes --

    M fetch.bs (59)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1067.patch
https://github.com/whatwg/fetch/pull/1067.diff

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https://github.com/whatwg/fetch/pull/1067