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This CL is pre-work for extracting ForceInstalledTracker related unit
tests from force_installed_metrics_unittest.cc.
This CL extracts the common elements in a test base class which could
be used for unit tests of both ForceInstalledMetrics and
ForceInstalledTracker.

Bug: 1086430
Change-Id: I60a190012b640d87f1dc5f8d3e4e19fcc683dd53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416588Reviewed-by: Oleg Davydov <burunduk@chromium.org>
Commit-Queue: Saurabh Nijhara <snijhara@google.com>
Cr-Commit-Position: refs/heads/master@{#808854}