[w3c/browser-payment-api] Validate payment method data (#381)

This is part of w3c/webpayments-methods-card#20. What remains is for the basic-card specification to define its validate payment method data algorithm.

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This is on top of #374 and should not be merged until that is.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/381

-- Commit Summary --

  * Various fixes to the PaymentRequest constructor
  * Validate payment method data

-- File Changes --

    M index.html (323)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/381.patch
https://github.com/w3c/browser-payment-api/pull/381.diff

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