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This is (3) in
https://docs.google.com/document/d/1sMG4xAT-myWtFaNa0kuLjRqsyxSy12ahgRIbffy1Bxk/.

Bug: 1018050
Change-Id: Ib265bd86153842b4f90c836fb0b06d200e94a787
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880361
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709882}