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Context:
This CL adds a test for payment abortion. The test calls request.abort()
from the merchant side.

Expectation:
The test expects that the request.show() promise would be rejected with
the reason written in the exception message.

Bug: 1042892

Change-Id: Ib764ad689a6b114a45e86d8351086c9a4519fbfe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040440
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741551}