[w3c/browser-payment-api] Define [[waitForUpdate]] and make it clear where it lives (#407)

Closes #371.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/407

-- Commit Summary --

  * Define [[waitForUpdate]] and make it clear where it lives

-- File Changes --

    M index.html (51)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/407.patch
https://github.com/w3c/browser-payment-api/pull/407.diff

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