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So this patch adds quotes.

See https://tools.ietf.org/html/draft-ietf-httpbis-header-structure-06#section-3.7
and https://github.com/mikewest/sec-metadata/commit/98f7c1253e8dd8a0e1606c2f443772b0c9d562b4.

Bug: 843478
Change-Id: I29dfa3a87e3c65a1b64009e173faa6d0f41b40f4
Reviewed-on: https://chromium-review.googlesource.com/1109819
Commit-Queue: Mike West <mkwst@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569554}