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This CL makes the PendingAppManagerImpl unit test use the
TestWebAppProvider paradigm for more consistent test flow.

Bug: None
Change-Id: Ifea2c7ebae72a87a75b75dfddb725e1d105033fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732699
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683918}