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Also removes the interface, since there is only the one implementation
now.

Bug: 679030
Change-Id: I5a758c29284464a5341b2eae6665aca5d2cf2674
Reviewed-on: https://chromium-review.googlesource.com/576200Reviewed-by: Helen Li <xunjieli@chromium.org>
Commit-Queue: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487651}