feedback: Use components/feedback/OWNERS.

BUG=chromium:1125007
TEST=CQ

Fixed: chromium:1125007
Change-Id: Ie0317463f0e0b4b5bb602a64229f5ce3486df459
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398960
Auto-Submit: Miriam Zimmerman <mutexlox@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804941}

chrome/browser/feedback/OWNERS

-afakhry@chromium.org
-zork@chromium.org
+file://components/feedback/OWNERS
 
 # COMPONENT: Platform>Apps>Feedback