[w3c/payment-request] Dont block UI if .updateWith() not called (closes #589) (#591)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/591

-- Commit Summary --

  * dont block UI if .updateWith() not called (closes #589)
  * Add [[didUpdate]] internal slot

-- File Changes --

    M index.html (34)

-- Patch Links --

https://github.com/w3c/payment-request/pull/591.patch
https://github.com/w3c/payment-request/pull/591.diff

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