Use base::size rather than arraysize in third_party/zlib/.

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

BUG=837308
R=agl@chromium.org

Change-Id: I4505d29594dba38102d90f07276afb3828fcf995
Reviewed-on: https://chromium-review.googlesource.com/c/1399517
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#620624}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: dfab7a3df6f5040cf0a79ebf2fc19edf7925ef78
1 file changed