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I'm converting some tests, and would like to avoid having to update a bunch
of places to use lower case strings.

BUG=756085
TEST=none

Change-Id: I4beba5088736a6f1c9dbf040741073ce19016097
Reviewed-on: https://chromium-review.googlesource.com/c/1329930Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606986}