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This CL provides a cleaner way to report session state changes with the following:
1. Removes onError() callback on ClientSession Handler.  Instead, if an error
   is encountered before the session connects, onConnectionFailed() will be called,
   and similarly, onDisconnected() will be called for errors encountered after
   a session is connected.
2. Removes the sessionStateChanged event on clientSession, so session state
   are reported consistently through the ClientSession.EventHandler interface.

BUG=477522

Review URL: https://codereview.chromium.org/1093373005

Cr-Commit-Position: refs/heads/master@{#326853}