gtk3-gi: use Gtk::Stock::XXX style instead of Gtk::STOCK_XXX
gtk3-gi: use Gtk::Stock::XXX style instead of Gtk::STOCK_XXX

kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2