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The same test was previously crashing over all platforms, which
led to disabling it over all of them. However, the problem now
with Mac OS. Thus, disabling it only for Mac OS.
See: https://ci.chromium.org/p/chromium/builders/ci/Mac10.13%20Tests%20%28dbg%29/19839

TBR=jdeblasio@chromium.org

Bug: chromium:1122078
Change-Id: I773ffb8ce9dc8f751c90010979b0e4dcbf89c5a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376855Reviewed-by: Amr Aboelkher <amraboelkher@google.com>
Commit-Queue: Amr Aboelkher <amraboelkher@google.com>
Cr-Commit-Position: refs/heads/master@{#801863}