Adding mamir@ to components/password_manager owners.

Change-Id: I02e2ea17d0d10ca3898bfd732399176a1b1f4908
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087399Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746757}

components/password_manager/OWNERS

 dvadym@chromium.org
 jdoerrie@chromium.org
 kolos@chromium.org
+mamir@chromium.org
 vasilii@chromium.org
 
 # COMPONENT: UI>Browser>Passwords