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For SyncExponentialBackoffTest.OfflineToOnline, methods were added to
simulate and reset a network failure. The old (Python server) way of
doing this has been deleted from SyncTest.

For SyncExponentialBackoffTest.TransientErrorTest, a TRANSIENT_ERROR
is now triggered on FakeServer. The old way of doing this,
SyncTest.TriggerTransientError(), has been deleted.

BUG=406545

Review URL: https://codereview.chromium.org/642613002

Cr-Commit-Position: refs/heads/master@{#299034}