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And simplifies the implementation a bit.

BUG=none
TEST=none

Change-Id: I1464e636597952f94f5a960eccbefec810fb686c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343786Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796160}