Every time I sign into Chrome on a fresh install, I see the following log spam:

[89953:91532:1212/151458.897071:WARNING:server_connection_manager.cc(269)] ServerConnectionManager forcing SYNC_AUTH_ERROR
[89953:91532:1212/151458.897246:WARNING:syncer_proto_util.cc(338)] Error posting from syncer: Response Code (bogus on error): -1 Content-Length (bogus on error): -1 Server Status: SYNC_AUTH_ERROR

This error is meaningless, it's an artifact of how we use HTTP and authentication, the error is actually faked early to avoid wasted round trips. We should remove this from default logging at very least.