Do not try to run ui_chromeos_unittests on linux_chromium_gn_rel trybot.
Do not try to run ui_chromeos_unittests on linux_chromium_gn_rel trybot.

It causes the following error on tryserver.blink:

ninja: error: unknown target 'ui_chromeos_unittests'

http://build.chromium.org/p/tryserver.blink/builders/linux_chromium_gn_rel/builds/34621/steps/compile/logs/stdio

As exposed by https://codereview.chromium.org/1122693002.

BUG=483171
TEST=trybots
TBR=dpranke@chromium.org

Review URL: https://codereview.chromium.org/1120613003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#328070}

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