[whatwg/fetch] Use ReadableStreamPipeTo in Request constructor (#959)

We have used an imprecise sentence for creating a ReadableStream "from which
one can read the exactly same data as one could read" from the original
ReadableStream, because transform streams and piping were not defined. Now they
are available, so let's use them.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/959

-- Commit Summary --

  * Use ReadableStreamPipeTo in Request constructor

-- File Changes --

    M fetch.bs (16)

-- Patch Links --

https://github.com/whatwg/fetch/pull/959.patch
https://github.com/whatwg/fetch/pull/959.diff

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