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: refs/heads/master@{#314822}
1 file changed