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

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

BUG=837308
TBR=stevenjb@chromium.org

Change-Id: Ieb7a1f942d2903a499e558ad783071197f84c5e4
Reviewed-on: https://chromium-review.googlesource.com/c/1390899
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618885}
18 files changed