Using "no_chromium_code" is a bit less strict, but ANGLE should be
able to handle slightly stricter warnings.

BUG=angleproject:1449

Change-Id: Ifaf77201085dd70cf5ff628b1aa02de55c5e96ba
Reviewed-on: https://chromium-review.googlesource.com/360940Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>