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Not clear why it wasn't running, and network_service_browser_tests,
not_site_per_process_browser_tests, viz_browser_tests already all run and
pass -- and what's better than running browser_tests three times? Running it
four times, so add vanilla browser_tests too.

Bug: 843511
Change-Id: I682375c0c4a5a673a0e5410452d5560cad3ccebd
Reviewed-on: https://chromium-review.googlesource.com/1117019
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570771}