[Autofill] Update Google Pay payment methods settings link

Providing a |user_index| to GetManageInstrumentsUrl() and
GetManageAddressesUrl() is no longer necessary, as per
https://b.corp.google.com/issues/111262297 the page will
select the default user automatically.

Bug: 940038
Change-Id: Icbff222326b6c3517002f5d543052b1e3dea10ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1512787
Commit-Queue: Jared Saul <jsaul@google.com>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639654}
9 files changed