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The default is changed from WARN to NONE.

Bug: 1145025
Change-Id: Iab4cd336ebf44d2a71eabb199bf7f2cfcdebfc6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517006Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823703}