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This change rewrites the single Payments API layout test that uses Mojo
mock services to use the new Mojo JS bindings.

Bug: 699569
Change-Id: I6fa74bfb2e926d35ccf3232c87f7a0114592ce9a
Reviewed-on: https://chromium-review.googlesource.com/595246
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Yuzhu Shen <yzshen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491080}