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The new CupsProxyService adds more libCUPS dependent code to Chrome, but
it doesn't look like any of the trybots currently run them. This change
combines the new tests into a new target set to run in the
ChromeOS VM trybot (chromeos-amd64-generic-rel).

Bug: chromium:945409
Test: trybot runs and passes
Change-Id: I4ef5724a3d4b0923fba3abcd7fde8bb744209c2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797002Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Sean Kau <skau@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713269}