Add HttpServerPropertiesManagerTest.UpdateCacheWithPrefs.
Add HttpServerPropertiesManagerTest.UpdateCacheWithPrefs.

Add HttpServerPropertiesManagerTest.UpdateCacheWithPrefs to test that
preferences like AlternateProtocol, SupportsQuic, and ServerNetworkStats are
saved to PrefService properly.

BUG=392575

Review URL: https://codereview.chromium.org/893403005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#314822}

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