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"TODO... implement" has stayed unimplemented since 2014 (commit 630a27a6,
https://codereview.chromium.org/118463002)

Change-Id: I944d5d8c1e226f221e5c3c4f4a85d8f421a291e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716398
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681130}