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This reduces noise due to this warning, which can happen on the order
of 10 times at browser launch and more times thereafter.

Change-Id: Iecdb28d995eb5867a506f84112ef8fcf8794dbce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2160037Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762047}