Remove myself from extensions OWNERS files.

Change-Id: I21f5d472325103e2970a54197736259ea8177dd1
Reviewed-on: https://chromium-review.googlesource.com/1125287Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Jeffrey Yasskin <jyasskin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572372}

chrome/browser/extensions/api/extension_action/OWNERS

-jyasskin@chromium.org
-
-# COMPONENT: Platform>Extensions>API