These warnings are currently disabled because these files are not with
angle_code set to 1 in the gyp files to avoid gtest's code warnings.
We hope to either fix warnings in gtest or change our build system to
not use warnings for gtest.

BUG=angleproject:1003

Change-Id: I281781b77f92ef8c394dd53fbbd50d525e4da5c9
Reviewed-on: https://chromium-review.googlesource.com/271412Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>