Also, this updates the SSLErrorHandler browser tests to use their own
NetworkTimeTracker, instead of the global one. The global one can be
influenced by the field trial config (e.g. might perform a query on startup
before the test has a chance to disable background queries). So the tests
must use their own NetworkTimeTracker to ensure that it behaves as
desired.
BUG=
Review-Url: https://codereview.chromium.org/2653443002
Cr-Commit-Position: refs/heads/master@{#445589}
53a47b4102