[whatwg/fetch] Be clearer about the underlying source of a constructed ReadableStream. (#781)

It could be that this should call https://streams.spec.whatwg.org/#create-readable-stream or https://streams.spec.whatwg.org/#create-readable-byte-stream (#267?) instead of trying to go through the `ReadableStream()` constructor, with all the ambiguity about how modifying `Object`'s prototype should affect things.

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

  https://github.com/whatwg/fetch/pull/781

-- Commit Summary --

  * Be clearer about the underlying source of a constructed ReadableStream.

-- File Changes --

    M fetch.bs (8)

-- Patch Links --

https://github.com/whatwg/fetch/pull/781.patch
https://github.com/whatwg/fetch/pull/781.diff

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