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Some libc++ tests fail when the mac_upload_clang bot is run on LUCI
instead of Buildbot, and it's not clear why.

Since we don't really care about testing libc++ here, don't run those
tests to unblock the LUCI migration.

Bug: 731375
Change-Id: I273e0345098795cf27cb527873b04ddf8945bb83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1680546
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Reid Kleckner <rnk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675700}