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Before this patch, both "abort" and "can make payment" shared a
PaymentEventResultCallback type, which creates a lot of code churn when
only one of the event types needs an update.

This patch splits PaymentEventResultCallback into CanMakePaymentCallback
and AbortCallback.

After this patch, changing the parameters for "can make payment"
callback will be easier.

Bug: 1005076
Change-Id: I0df01a8a8b4551a16f1949d77ffd546df7ea5702
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2091646
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Sahel Sharify <sahel@chromium.org>
Auto-Submit: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749347}