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betty-pi-arc should be identical to betty, but with a newer version of
android. Since basic gtest unittest suites shouldn't interact with that
level of the system, running them on both the vanilla betty and betty-pi-arc
bots is redundant.

Also rename & refactor several chromeos suites in test_suites.pyl to make
things clearer.

Bug: 1000513
Change-Id: I7755323689bb85f11174132267927c46e4885a42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867207Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707138}