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For a while there was work looking into getting telemetry_perf_unittests and
telemetry_unittests up and running on linux-chromiumos. However instead there
is now a desire to just get an actual ChromeOS device on the CQ.

This will resolve our coverage needs.

We've been using the Mojo Chromiumos FYI bot to investigate this. But the tests
have been broken there for a while. This change removes those configs.

TEST=telemetry_perf_unittests, telemetry_unittests

Bug: 836447
Change-Id: I8870c69dae811101d4869e3c7ede28771ecbf905
Reviewed-on: https://chromium-review.googlesource.com/1107838Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568834}