https://android.googlesource.com/platform/external/vulkan-validation-layers.git/+log/bcb80d06bbdc09..f47c534fee2f26f

Disables Vulkan in ANGLE temporarily - a second CL will follow with
the updated build files once ANGLE is rolled into Chrome.

In particular, this roll contains a fix for a vs2017 signed/unsigned
mismatch warning as error.

BUG=chromium:683729

Change-Id: Ib23370d79f1359ab290f08e14a847eed75251660
Reviewed-on: https://chromium-review.googlesource.com/458531Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>