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This allows us to switch between prod and prototype servers when needed.

BUG=1107976

Change-Id: I945fcf7824c3463bc51b74c2e9a56747a0704414
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309812Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Reviewed-by: Hesen Zhang <hesen@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791006}