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No one is calling these methods, instead GetDisplayNodes() is used.

Bug: 843995
Change-Id: I76d5a711527eca20497fdc283ca55e47683b37a3
Reviewed-on: https://chromium-review.googlesource.com/1090283Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566005}