Add COMPONENT: UI>Browser>Autofill

See https://tinyurl.com/yxau5sc4 for context.

Bug: 977050
Change-Id: I6f7f0c0de66cb32990d0e3b4e985142d65a5cc14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808070
Commit-Queue: Eric Foo <efoo@chromium.org>
Auto-Submit: Eric Foo <efoo@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#698551}

components/autofill_payments_strings_grdp/OWNERS

 file://components/autofill/core/browser/payments/OWNERS
+
+# COMPONENT: UI>Browser>Autofill
+# TEAM: payments-autofill-team@google.com