Add a better fallback for file chooser when it doesn't use headerbar
Add a better fallback for file chooser when it doesn't use headerbar

https://bugzilla.gnome.org/show_bug.cgi?id=728358

Distrotech/gnome-themes-standard,Distrotech/gnome-themes-standard,DoctorJellyface/gnome-themes-standard,DoctorJellyface/gnome-themes-standard