This workaround appears to cause problems on Mac ASAN builds.
Disabling it while investigating the root cause.

BUG=1017337
BUG=angleproject:3997

Change-Id: I16a2f07f8fc69ec4d5ab40a5bf521c43f6854a49
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1879873Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>