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Before this patch, "abort" and "can make payment" shared the
RespondWithCallbacks::CreateForEvent() static method, where the
developer had to specify the type of the event.

This patch splits CreateForEvent() into CreateForCanMakePayment() and
CreateForAbort() methods.

After this patch, the developer does not have to specify the event type
when creating a RespondWithCallbacks object.

Bug: 1005076
Change-Id: I16300965d2477711677bbfbeb347351663b320d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2086071Reviewed-by: Danyao Wang <danyao@chromium.org>
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748830}