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Overrides Dawn's Vulkan validation layers path to reuse the one in
ANGLE.

TBR=dpranke@chromium.org
BUG=dawn:150

Change-Id: Ibf4e513db2c2cb1a89613f1e3ab679f56bcf1c86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864394Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706458}