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These code are no longer used and can be removed.

Bug: 786616
Change-Id: I81782e7935026d36c9d3207da4db11c80057e3bf
Reviewed-on: https://chromium-review.googlesource.com/780585Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518365}