GTK: Remove use of deprecated gtk_dialog_set_has_separator

chrome/browser/ui/input_window_dialog_gtk.cc

Index: chrome/browser/ui/input_window_dialog_gtk.cc
diff --git a/chrome/browser/ui/input_window_dialog_gtk.cc b/chrome/browser/ui/input_window_dialog_gtk.cc
index 53236a7741e8415d9a8711acba9c7a67d44f6394..8e4af80aed51cbb37d80b35d48b2179d36e43078 100644
--- a/chrome/browser/ui/input_window_dialog_gtk.cc
+++ b/chrome/browser/ui/input_window_dialog_gtk.cc
@@ -26,7 +26,9 @@ InputWindowDialogGtk::InputWindowDialogGtk(GtkWindow* parent,
                   NULL)),
       delegate_(delegate) {
   gtk_dialog_set_default_response(GTK_DIALOG(dialog_), GTK_RESPONSE_ACCEPT);
+#if !GTK_CHECK_VERSION(2, 22, 0)
   gtk_dialog_set_has_separator(GTK_DIALOG(dialog_), FALSE);
+#endif
   gtk_window_set_resizable(GTK_WINDOW(dialog_), FALSE);
 
   GtkWidget* content_area = gtk_dialog_get_content_area(GTK_DIALOG(dialog_));