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This pseudo-header is defined in
https://tools.ietf.org/html/draft-ietf-httpbis-h2-websockets-00.

This CL lands server change 184848446 by bnc.

BUG=488484

Change-Id: I32000864d0f5cfef66767b8b23ddf4749c61cfc3
Reviewed-on: https://chromium-review.googlesource.com/925624
Commit-Queue: Bence Béky <bnc@chromium.org>
Reviewed-by: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537848}