[ios] Adds gogerald as discover_feed OWNER

Bug: 1085419
Change-Id: I88648fb865e96a839b691c762518b2076b5fcd2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311051
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Auto-Submit: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790542}

ios/public/provider/chrome/browser/discover_feed/OWNERS

-sczs@chromium.org
+sczs@chromium.org
\ No newline at end of file
+gogerald@chromium.org
\ No newline at end of file