[ios] Use base::size() instead of arraysize

arraysize is deprecated, we should use base::size() instead.
This CL changes arraysize to base::size in ios

Bug: 837308
Change-Id: Ic24c06e57f254976ee791f7094313cdbd0125ed7
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/c/1257469
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599474}
30 files changed