Add kojii@ to harfbuzz OWNERS

Bug: N/A
Change-Id: Id8050ad419632332b564cf5eee8e0475ee6e120f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340783Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795351}

third_party/harfbuzz-ng/OWNERS

@@ -4,6 +4,7 @@ bungeman@chromium.org
 drott@chromium.org
 eae@chromium.org
 jshin@chromium.org
+kojii@chromium.org
 
 # TEAM: layout-dev@chromium.org
 # COMPONENT: Blink>Fonts