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Creates a new payments_section.html/js (credit cards for now).

With Autofill Home disabled, will add a new row in the Advanced Passwords and Forms
section to go to the credit cards section. There used to be one general Autofill
row that had both addresses and credit cards.

With Autofill Home enabled, the "Payments" row on the People page will now lead
to a payments-only section, and the "Addresses" row will lead to its own section
as well.

This is one change of several that will also clean up the settings toggle to
hopefully have a clearer story.

Screenshots of the change: https://goo.gl/iZWkCE (internal)

Bug: 860526
Test: browser_tests
Change-Id: I7572ccc71633ee806b4a5db522a64e2b4f79d5dc
Reviewed-on: https://chromium-review.googlesource.com/1152475
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579779}