Use base::size rather than arraysize in ui/.

This is purely a mechanical change; there is no intended behavior change.

BUG=837308
TBR=thakis@chromium.org

Change-Id: I0905add39f418f48c0c70b76db8cbc1cc91eefb7
Reviewed-on: https://chromium-review.googlesource.com/c/1390107
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618865}
130 files changed