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This CL is a refactor with no intended behavior change.

Bug: 832879
Change-Id: I5d2d04d37f03f8ccbaef28695bc29a6b24b2e089
Reviewed-on: https://chromium-review.googlesource.com/1040592
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556210}