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This suite was useful when we were first spinning up tests on CrOS, as
it provides a smoke check of the browser.

Since then, we've also integrated Tast tests. And as more Tast tests
have been written, they've grown to provide coverage of everything that
the sanity test provided. (eg: tests like ui.ChromeLogin check the
browser's log in flow, arc.* tests cover ARC functionality.)

These days, you'll never see the sanity test fail without also seeing
at least one Tast test failing.

Bug: None
Change-Id: I2a7db54bec15eac7bf909970cdf21946a306817b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518661
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#824084}