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These tests are Slow not only on Mac10.13, but in general.
Let me update the entry not to be Mac10.13 specific, and
not to be virtual/outofblink-cors(-ns) specific.

Bug: 869800
Change-Id: I76f13714b93b314a14c16dae5e110a841547d92c
Reviewed-on: https://chromium-review.googlesource.com/1160136Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580134}