Currently ash::network_icon makes liberal use of calls to the NetworkHandler singleton instance. This is scheduled to be replaced with a mojo API in Mash.

Since NetworkIcon is a series of utility functions and not a class, the code needs to be re-factored to either be a class with a connection to the mojo API, or the properties it needs should be entirely encapsulated into the NetworkState instances passed to it, which would allow a straightforward replacement of chromeos::NetworkState with chromeos::network_config::mojom::NetworkStateProperties.