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Before this patch the payment request UI did not properly handle cancel
and back button.

This patch notifies the Autofill Assistant controller to shut down
gracefully with a 'give up' message whenever the payment request UI has
been canceled.

Bug: 806868
Change-Id: Ie3d83bf48a2004f0a6a72763c4b509b3db023ff9
Reviewed-on: https://chromium-review.googlesource.com/c/1326499
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606883}