[whatwg/fetch] Be strict on request's Content-Type (#829)

Tests: https://github.com/web-platform-tests/wpt/pull/13921.

Helps with #814.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/829

-- Commit Summary --

  * Be strict on request's Content-Type

-- File Changes --

    M fetch.bs (45)

-- Patch Links --

https://github.com/whatwg/fetch/pull/829.patch
https://github.com/whatwg/fetch/pull/829.diff

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