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Before this patch, requesting "secure-payment-confirmation" method in
PaymentRequest API would not validate the parameters.

This patch adds the "secure-payment-confirmation" parameters to
PaymentRequest API and validates them, if the
"SecurePaymentConfirmation" feature is enabled.

After this patch, PaymentRequest API validates the secure payment
confirmation parameters.

Explainer: https://github.com/rsolomakhin/secure-payment-confirmation
Feature status: https://chromestatus.com/feature/5702310124584960
Intent to prototype:
https://groups.google.com/a/chromium.org/g/blink-dev/c/myUR5gyd5Js/m/iELL67NQAgAJ

Bug: 1110324
Change-Id: I7a4b6f9da1b3e1d7604bcd9e4733dc789f77ec4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341163Reviewed-by: Nick Burris <nburris@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Auto-Submit: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796792}