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Before this patch, when calling updateWith() w/o shippingOptions in
PaymentRequestUpdateEvent, it will be set to empty array by force. This
is a implementation bug and doesn't match behavior with the spec[1].
It cause that calling updateWith() with no shippingOptions resets the
shipping address on payment sheet UI.

To resolve the problem, this patch makes the shippingOptions member
optional. FYI, we already fixed it for payerdetailchange and
paymentmethodchange events[2].

Use count data:
  https://www.chromestatus.com/metrics/feature/timeline/popularity/2622
  https://www.chromestatus.com/metrics/feature/timeline/popularity/2623

[1] https://w3c.github.io/payment-request/#update-a-paymentrequest-s-details-algorithm
[2] https://chromium-review.googlesource.com/c/chromium/src/+/1280563

Bug: 902291
Change-Id: If7b2ba6890ac4905ad1acf79c034fe866ec3beb4
Reviewed-on: https://chromium-review.googlesource.com/c/1438980Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Cr-Commit-Position: refs/heads/master@{#628570}