Remove ChannelArguments (#1198)
Remove ChannelArguments (#1198)

This was introduced by #1179 but seems unused.
cartographer-project/cartographer,damonkohler/cartographer,googlecartographer/cartographer,damonkohler/cartographer,wohe/cartographer,larics/cartographer,wohe/cartographer,larics/cartographer,googlecartographer/cartographer,wohe/cartographer,larics/cartographer,googlecartographer/cartographer,googlecartographer/cartographer,cartographer-project/cartographer,cartographer-project/cartographer,damonkohler/cartographer,cartographer-project/cartographer,wohe/cartographer,larics/cartographer,damonkohler/cartographer