[iOS] Add kkkhorimoto to ios/chrome/browser/ui/reading_list/OWNERS

Bug: none
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ia3b575c49748d354654217f2cf36d0bb8be8fbaf
Reviewed-on: https://chromium-review.googlesource.com/1079310
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562935}
1 file changed