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Increase the size of QuicHttpStream::raw_request_body_buf_ based on the
size of the body.  For large bodies and fast networks, this give a nice
reduction in CPU (or boost throughput if CPU bound) (~10-20%).

R=rch@chromium.org

Bug: 709144
Change-Id: If4fc69f9f89866b75b6d09d728e53a7bfa2054e4
Reviewed-on: https://chromium-review.googlesource.com/581877Reviewed-by: Buck Krasic <ckrasic@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Buck Krasic <ckrasic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488765}