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These methods are never called by other classes, no need to mark them public.

Bug: 
Change-Id: I453e5831d60ac2970029c16fdd3011b012120695
Reviewed-on: https://chromium-review.googlesource.com/565963Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486142}