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It's possible to write a fixtureless test by using TEST() instead of
TEST_F(). Do this as it is slightly cleaner.

Bug: none
Test: events_unittests

Change-Id: I67f50d73d01595de29f6346ef977891d6ea7b1c2
Reviewed-on: https://chromium-review.googlesource.com/c/1294569Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601732}