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Disables the multiple crash minidump test on Mac 10.12 Sierra. It is
currently failing 100% of the time on this OS due to only getting the
unsymbolized stack trace for the first crash.

TBR=crouleau@chromium.org

Bug: 634156
Change-Id: I0378b43cd88474156085def292ba35d13ce5680c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1695656Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676113}