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This function is not used anywhere.

Change-Id: I4116ef0634a1db7b1aacfc5326e662ce3abfe136
Reviewed-on: https://chromium-review.googlesource.com/1144816Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577446}