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This CL adds kReadOnceStream enum value for fetch upload streaming
instead of kChunkedDataPipe.
kReadOnceStream means the data is non repeatable unlike
kChunkedDataPipe.

This is a preparation for
"[fetch] Cache request stream body up to 64k bytes."
(crrev.com/c/2269622)

Bug: 1077174, 688906
Change-Id: I78c45777eb85751b20287bab6e55be0dd3502cb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2342525
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798515}