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And some minor refactoring.

Bug: 789577
Change-Id: I365024a2e29b71e8aaa3cfecabe4f70eb31c8808
Reviewed-on: https://chromium-review.googlesource.com/965661Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543655}