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This change reduces the number of stories that we run as part of
system_health_smoke_test from 82 to 27. We do this by limiting ourselves
to health_check stories, which are recognized as the most important to
maintain. (Note also that we aren't running all of the 27 since some of
those are currently temporarily disabled.)

Bug: 1019383
Change-Id: I271a0e94288177e9387c9f5551ff44d6e072b9d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888136Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710550}