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This config makes a difference for test suite to pass or not.
See crbug.com/1115229#c51. So add it the trybot config.

Bug: 1115229
Change-Id: Ib7c738608ebc2ff6e92d6287b38ea52354254fa5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380103
Auto-Submit: Haiyang Pan <hypan@google.com>
Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802379}