remove unneeded elements. (tree_selection_changed): removed

remove unneeded elements. (tree_selection_changed): removed

Sat Mar  6 23:31:18 2004  Jonathan Blandford  <jrb@gnome.org>

        * gtk/gtkfilechooserdefault.c (struct _GtkFileChooserDefault):
        remove unneeded elements.
        (tree_selection_changed): removed
        (tree_name_data_func): removed
        (gtk_file_chooser_default_finalize): don't unref dir model
        (create_folder_tree): removed
        (get_selection): no longer need to abstract away the selection
        function.
        (create_file_list): We now create a tree for all actions.
        (file_pane_create): Make one tree.
        (update_appearance) We really change the mode only, now.