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Convert keyboardSelectDriveDirectoryTree as an example.

Bug: 909056
Change-Id: Ie08b6a787f4d9397d832f435b8f650d647e61ceb
Reviewed-on: https://chromium-review.googlesource.com/c/1349157
Commit-Queue: Sam McNally <sammc@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612062}