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These unions members are not part of upstream and will be removed from
our headers shortly, so use the void pointer member instead.

BUG=b:161415741
TEST=Chromium builds for arm-generic.

Change-Id: I4ac869d2cfc52d4c051e1a28e4eca2f83ec24264
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423652
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Fritz Koenig <frkoenig@chromium.org>
Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809830}