Remove non-existing SPDY WebSocket pseudoheaders.

It just happens so that
https://tools.ietf.org/html/draft-ietf-httpbis-h2-websockets-00 defines
these as headers not pseudoheaders (no ":" at the beginning).

Also fix some includes.

Bug: 801564
Change-Id: Ied8b4c1fdf27d3207b4fa29f264e816bd9cdfbf6
Reviewed-on: https://chromium-review.googlesource.com/906811
Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535363}
5 files changed