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This rename ensures a clear differentiation between VerticalDivider
and HorizontalDivider.

Skip the presubmit checks since the Text Appearance check fails, even
if this change doesn't touch the faulty lines.
NOPRESUBMIT=true

Change-Id: Ica0d148209966bdffd33b999b0aa300cd0673cf7
Reviewed-on: https://chromium-review.googlesource.com/1186621Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585808}