GitLab

The via header can have multiple space separated entries, if it hits
the staging server and the prod server. So relaxes the exact equality
check.

Bug: 960105
Change-Id: Ib50ee751f40b0892376a4ae622f0ac061efb401d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600632
Commit-Queue: rajendrant <rajendrant@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657743}