Re: [w3c/payment-request] Rethink "payment request is showing" boolean (#809)

@marcoscaceres I would suggest we don't make this a CR-Exit issue as it is adding complexity that we haven't really explored and could be bigger than we think.

Example: 
 - How does the browser respond if it is mid-flow with a BobPay payment (which declares itself as being a singleton - i.e. mimic the existing spec) and another tab/windows starts a BobPay payment?
 - How does BobPay declare that it must be a singleton?
 - How does does a non-Web payment handler declare this? (like an Android app)
 - Etc



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