Add COMPONENT: UI>Browser>Payments

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

Bug: 977050
Change-Id: I1d633f24dbc8d146cdcb0991bc15d6fc0dd472da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808073
Auto-Submit: Eric Foo <efoo@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Eric Foo <efoo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698547}

components/payments_strings_grdp/OWNERS

 file://components/payments/OWNERS
+
+# COMPONENT: UI>Browser>Payments