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The associated unit test is also moved.

Change-Id: Ia35c2873d8c40071f204fbecc064285ee3ed0ecf
Reviewed-on: https://chromium-review.googlesource.com/c/1277373
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598910}