IO_ERROR           45 sync/engine/net/server_connection_manager.cc     ENUM_CASE(IO_ERROR);
IO_ERROR           71 sync/engine/net/server_connection_manager.cc   return IO_ERROR;
IO_ERROR           96 sync/engine/net/server_connection_manager.cc     response->server_status = HttpResponse::IO_ERROR;
IO_ERROR          111 sync/engine/net/server_connection_manager.cc     response->server_status = HttpResponse::IO_ERROR;
IO_ERROR           91 sync/engine/syncer_proto_util.cc     case HttpResponse::IO_ERROR: