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This CL allows PaymentRequestSpec to provide the PaymentOptions that
is saved in payment_request_spec.

Bug: 1148936

Change-Id: I05451f4d76f759b6aad9b3c1c893901789e0f805
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537058
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827643}