[whatwg/fetch] Define Content-Type for ReadableStream. (#961)

https://fetch.spec.whatwg.org/commit-snapshots/7db8ac52245d6f0abaaeec6ae1cd96553c30b737/#body-mixin

> If the keepalive flag is set, then throw a TypeError\.
> 
> If object is disturbed or locked, then throw a TypeError\.
> 
> Set stream to object\.


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