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Recent Clang versions started taking into account that enums are signed
on Windows when emitting these warnings.

Bug: 792519
Change-Id: I5029cde81ac6f1777ec2317d431d55589b814465
Reviewed-on: https://chromium-review.googlesource.com/811685
Commit-Queue: Mark Mentovai <mark@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522226}