[w3c/payment-handler] Change the patterns of returning promise to more readable patterns. (#186)

This PR is initiated from #180. We should change the patterns of returning
promise to more readable patterns as follows:
  BEFORE
    Let p be a new promise.
    Run the following steps in parallel:
      Do something
      Resolve p
    return p

  AFTER
    Let p be a new promise.
    Return p and perform the remaining steps in parallel:
    Do something
    Resolve p

FYI, the patterns are already widely used in PaymentRequest API spec.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/186

-- Commit Summary --

  * Change the patterns of returning promise to more readable patterns.

-- File Changes --

    M index.html (369)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/186.patch
https://github.com/w3c/payment-handler/pull/186.diff

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