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Also turn the ReportingEndpointManager tests into unit tests, so that
this is testable without wiring up NetworkIsolationKey through all the
reporting code.

Bug: 993805
Change-Id: I0d511dd7eb5f1418bf0a29e853198c39b4b4ea97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842131
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703107}