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These buttons are subclasses of ImageButton or LabelButton. Since they
didn't set their focus behavior, they inherit the beahvior. This CL uses
DCHECK to assert such behavior, and set the behavior explicitly. So when
we change ImageButton and LabelButton's focus behavior later, these
buttons won't be affected.

Bug: 1001103
Change-Id: I88675c772b83348f68234d588a3c3884387fea84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495820Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820469}