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Either 675084 left this code dead or any remaining usage was removed
afterwards. Either way, it's safe to remove now.

My dream of fixing a CL with an identical bug number was narrowly
thwarted. :(

Bug: 788649
Change-Id: Icc408f328be611cff06320f4a93e81d0757e153b
Reviewed-on: https://chromium-review.googlesource.com/788648Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Blake O'Hare <blakeo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519563}