Make WebAuthn Java OWNERS match the other files.

All the WebAuthn directories have OWNERS that point to a master OWNERS
in //device/fido. The Java directory was different because other team
members were less familiar with it but we expect to be doing a lot more
Android work soon.

Change-Id: Ia64abcc78aacd9bc2b99c71e8217ee48b61f6127
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2070562
Auto-Submit: Adam Langley <agl@chromium.org>
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744014}

chrome/android/java/src/org/chromium/chrome/browser/webauth/OWNERS

-kenrb@chromium.org
-kpaulhamus@chromium.org
+file://device/fido/OWNERS
 
-# COMPONENT: Blink>WebAuthentication
 # TEAM: identity-dev@chromium.org
+# COMPONENT: Blink>WebAuthentication