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On some official build bots, r531606 causes a -Wunused-result error.

BUG=805615

Change-Id: I0f4f51a6eb07d67f3b4c552af7d5f115b5852095
Reviewed-on: https://chromium-review.googlesource.com/884505
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531707}