Re: [w3c/payment-request] Add hasEnrolledInstrument() again (for 1.1) (#931)

@dcrousso, I wonder if this is already covered by the [constructor](https://www.w3.org/TR/payment-request/#constructor)'s step 4.3.6.2. As the notes states, "This step assures that any IDL type conversion errors are caught as early as possible."

When doing the conversion there, it would throw if the required `unsigned long version` is missing. 

However, we could clarify in in the constructor that custom validation could also be performed there. 




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