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This patch adds the model for the secure payment confirmation UI. This
model holds all of the cross-platform data to be displayed in the UI.

Bug: 1110322
Change-Id: I4bc041b3712e7795028f37dcd8d883a4aee0d32b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333211Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Nick Burris <nburris@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795590}