I'm on Freya 0.3.1 64bit and get the message
Gtk-Message: Failed to load module "pantheon-filechooser-module"
when running an electron shell app.
I tried to start it with
GTK_MODULES=pantheon-filechooser-module electron .
and tried to set
gsettings set org.gnome.settings-daemon.plugins.xsettings enabled-gtk-modules "['pantheon-filechooser-module']"
but neither worked.
Any chance to enable that module?