[autofill] Make password_manager OWNERS own password related code

Bug: None
Change-Id: I5bbedbf640528bf5b62cd5f38db615e4ae6a9f5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498528Reviewed-by: Matthias Körber <koerber@google.com>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821219}

components/autofill/content/renderer/OWNERS

-per-file *password*=dvadym@chromium.org
-per-file *password*=kolos@chromium.org
-per-file *password*=vasilii@chromium.org
-
-per-file *username*=dvadym@chromium.org
-per-file *username*=kolos@chromium.org
-per-file *username*=vasilii@chromium.org
+per-file *password*=file://components/password_manager/OWNERS
+per-file *username*=file://components/password_manager/OWNERS

components/autofill/core/common/OWNERS

-per-file *password*=dvadym@chromium.org
-per-file *password*=kolos@chromium.org
-per-file *password*=vasilii@chromium.org
+per-file *password*=file://components/password_manager/OWNERS
 
 per-file autofill_payments_features.*=file://components/autofill/core/browser/payments/OWNERS