Re: [w3c/payment-request] Should we validate nonsense payer error properties? (#793)

I thought it would be better to throw an exception to give developers useful information and predictable code but my thought was changed after your comment[1].

I'm not sure but I think it's not different with passing undefined dictionary members.
```
// The payee is not PaymentValidationErrors's member.
// So, we just ignore it.
response.retry({ payee: { email: "Hello" }});
```

[1] https://github.com/w3c/payment-request/pull/768#pullrequestreview-151646708

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