Remove TODO for crbug.com/516883.
Remove TODO for crbug.com/516883.

BUG=516883
R=nednguyen@google.com,jbudorick@chromium.org

Review URL: https://codereview.chromium.org/1282493004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#342513}

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