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This CL has no intended behavior change.

This CL cleans up test structure and updates some comments.

Change-Id: I3b5ed07813ec416dd67098d9f93b702a115cee09
Bug: 827545
Reviewed-on: https://chromium-review.googlesource.com/1014371
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551418}