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This change is needed for the Harmony treeview, but it also looks better in the
non-Harmony treeview, so it's unconditional in this CL.

This change also removes the special background/foreground colors from the
example treeview. While those were useful as a demonstration, they are quite
garish and distracting when screenshotting the treeview :).

Bug: 610428
Change-Id: Icf14b2e1d5b8c20a6d72550cfe57436b3f31cce4
Reviewed-on: https://chromium-review.googlesource.com/695563Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506800}