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Before this patch, the test environment for an ARC PaymentAppService
unit test was being setup inside of the only PaymentAppService unit
test, which prevented sharing this environment among multiple unit test
files.

This patch separates the ARC PaymentAppService test environment into its
own test support file.

After this patch, it's possible to share the setup code for ARC
PaymentAppService test environment among multiple unit test files;

Bug: 1061503
Change-Id: If8271d7d277823dc53630bcdc4f6097bc9a6a2b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248749
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797746}