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

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

BUG=837308

Change-Id: I161fec9229ffbf84983d606c2b347a3e5a1829a5
Reviewed-on: https://chromium-review.googlesource.com/c/1390113
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618974}
14 files changed