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[PlayBilling] Add test coverage for AndroidPaymentAppFinder

The test coverage report shows that some new added code have not been
covered by tests[1]. This patch adds test coverage for these lines.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2141244/9/chrome/android/java/src/org/chromium/chrome/browser/payments/AndroidPaymentAppFinder.java

This patch also dedup the redundant codes with the newly added method
#assertPaymentAppsHaveIdentifiers() to give you a refreshed feeling.

Bug: 1064740

Change-Id: I104385d2fe26f00e6e2477211c5a5123a9eff045
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144314
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758072}