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No functional changes, other than replacing a "320" with a Harmony
constant of the same value.

Bug: none
Change-Id: Ia948c2fd608be294d5e0feadec7790f26941075a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2385238
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Caroline Rising <corising@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803622}