Added permissions owners to content settings ui code

Bug: 1016730
Change-Id: Ib4ff92de9ee966a1c68d35e32ff368ef6008cbdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883633
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709929}

chrome/browser/ui/content_settings/OWNERS

-engedy@chromium.org
+file://chrome/browser/permissions/PERMISSIONS_OWNERS
 felt@chromium.org
 msramek@chromium.org
 raymes@chromium.org