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We're planning on adding more non-gtest tests. The cleanup here will make
that simpler/easier.

Bug: 876587
Change-Id: Ie23bd9ed1e38a3dc9df90a087cd8637557683c8a
Reviewed-on: https://chromium-review.googlesource.com/1227148Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593040}