[w3c/payment-request] Call out payment handlers in abort() (#678)

Per 29 Jan 2018 Payment Handler API editor discussion [1], acknowledge
connection to payment handlers in abort() method.

Relates to Issue #476.

[1] https://www.w3.org/2018/01/29-apps-minutes#item02
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/678

-- Commit Summary --

  * Per 29 Jan 2018 Payment Handler API editor discussion [1], acknowledge

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/payment-request/pull/678.patch
https://github.com/w3c/payment-request/pull/678.diff

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