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This is a pure refactor, with no functional changes.

Bug: None
Change-Id: Id66cf951a8b060fdb2a0d4458dd48620d28b9d05
Reviewed-on: https://chromium-review.googlesource.com/c/1487873
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Auto-Submit: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635835}