Allow build under GTK+ 2.24.

chrome/browser/ui/libgtk2ui/print_dialog_gtk2.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h"
 
 #include <gtk/gtkunixprint.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 282 matching lines @@
           VLOG(1) << "Using custom paper size";
           GtkPaperSize* custom_size = gtk_paper_size_new_custom(
               requested_media.vendor_id.c_str(),
               requested_media.vendor_id.c_str(),
               requested_media.size_microns.width() / kMicronsInMm,
               requested_media.size_microns.height() / kMicronsInMm,
               GTK_UNIT_MM);
           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";
     }
   }
 
   gtk_print_settings_set_orientation(
       gtk_settings_,
       settings->landscape() ? GTK_PAGE_ORIENTATION_LANDSCAPE :
                               GTK_PAGE_ORIENTATION_PORTRAIT);
@@ skipping 218 matching lines @@
   context_->InitWithSettings(*settings);
 }
 
 void PrintDialogGtk2::OnWindowDestroying(aura::Window* window) {
   DCHECK_EQ(libgtk2ui::GetAuraTransientParent(dialog_), window);
 
   libgtk2ui::ClearAuraTransientParent(dialog_);
   window->RemoveObserver(this);
   Release();
 }