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

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

BUG=837308
TBR=servolk@chromium.org

Change-Id: I4d3709dfd6de58a44a806dbc52ada71623438532
Reviewed-on: https://chromium-review.googlesource.com/c/1390900
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618883}
15 files changed