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This CL is a refactor with no intended behavior change.

Change-Id: Ia4fd3f50e92674b1b16cb44488b6131e71d5d509
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625826Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843757}