[whatwg/fetch] Turn Body mixin's MIME type into a getter (#1137)

Tests: https://github.com/web-platform-tests/wpt/pull/27100.


Closes #1135.

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- [x] At least two implementers are interested (and none opposed):
   * Firefox
   * Chrome
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * https://github.com/web-platform-tests/wpt/pull/27100

- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/master/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: …
   * Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1684634

   * Safari: …

(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/1137


-- Commit Summary --

  * Turn Body mixin's MIME type into a getter

-- File Changes --

    M fetch.bs (30)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1137.patch

https://github.com/whatwg/fetch/pull/1137.diff


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