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This ensures these tests are testing the actual harmony/refresh behavior, and
makes sure as people add more calls to ChromeLayoutProvider to the code they
don't result in unexpected test crashes.

Bug: none
Change-Id: If21b7eec387dc47be448e2dbb2730ddacb7b51fe
Reviewed-on: https://chromium-review.googlesource.com/1121787
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572008}