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It's been unused since commit a5febff9 and null since
6bd4db44.

BUG=546754

Change-Id: Idbffc047f67d3c424a2d6557e50dac8be9d9cee4
Reviewed-on: https://chromium-review.googlesource.com/1236695Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Paul Miller <paulmiller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592971}