Code review comment for lp:~azzar1/unity/fix-994163

> 16 + typedef glib::Signal<void, GVolume*> VolumeSignal;
> 17 + sig_manager_.Add(new VolumeSignal(volume_, "changed",
> sigc::mem_fun(this, &DeviceLauncherIcon::OnVolumeChanged)));
>
> Since DeviceLauncherIcon just uses one signal I think that you can avoid to
> use the SignalManager and save some overhead by just adding a glib::Signal
> class member and using its Connect method...

Done.