Per discussion on the Payment Apps TF call:
* We can't provide any guarantees that, once a payment request is delegated beyond the browser, it can be aborted. Web-based payment apps are only one type of app.
* We can improve the Payment Handler specification to include a mechanism of passing the abort request to a web-based payment app.
## Proposal
Add a `paymentRequestAborted` event to the Payment Handler interface. The event will have a `respondWith` method that takes a boolean parameter indicating if the paymentRequest has been successfully aborted.
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https://github.com/w3c/webpayments-payment-apps-api/issues/117#issuecomment-291522464