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This feature was set up to be used in a finch trial that has since
ended. This change removes the now unused feature.

Bug: 1133378
Change-Id: Ic484aa7f72c94f1f3e5924580b39f8f7b783b891
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437006Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812513}