Pointing renderer/autofill OWNERS to top-level OWNERS

The OWNERS file in question has a list that mostly replicates the main
Autofill OWNERS file, in //components. However, this list has not been
updated regularly to reflect team changes. I think it makes the most
sense to simply use the same OWNERS for both places.

I'm leaving the per-file OWNERs for the password team, which is
consistent with what we've done in various other places in the codebase.

Change-Id: Ia183a78392c4623ea9cd4525cb59d175e80f69ff
Reviewed-on: https://chromium-review.googlesource.com/c/1497184
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Auto-Submit: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636925}

chrome/renderer/autofill/OWNERS

-dvadym@chromium.org
-estade@chromium.org
-mathp@chromium.org
-rogerm@chromium.org
-sebsg@chromium.org
+file://components/autofill/OWNERS
 
 per-file *password*=kolos@chromium.org
 per-file *password*=vasilii@chromium.org