Allow build under GTK+ 2.24.

chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc b/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc
index e050372a1954e93c440cd1e3973dd1c589eddb82..a6f6ae1a256c067278e371dfdd3d3be2a4f198d9 100644
--- a/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc
@@ -300,8 +300,14 @@ bool PrintDialogGtk2::UpdateSettings(printing::PrintSettings* settings) {
           gtk_page_setup_set_paper_size(page_setup_, custom_size);
           gtk_paper_size_free(custom_size);
         }
+#if GTK_CHECK_VERSION(2,28,0)
         g_list_free_full(gtk_paper_sizes,
                          reinterpret_cast<GDestroyNotify>(gtk_paper_size_free));
+#else
+        g_list_foreach(gtk_paper_sizes,
+                       reinterpret_cast<GFunc>(gtk_paper_size_free), NULL);
+        g_list_free(gtk_paper_sizes);
+#endif
       }
     } else {
       VLOG(1) << "Using default paper size";