GTK: Remove use of deprecated gtk_dialog_set_has_separator

chrome/browser/ui/gtk/extensions/extension_uninstall_dialog_gtk.cc

 // Copyright (c) 2011 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.
 //
 // Currently this file is only used for the uninstall prompt. The install prompt
 // code is in extension_install_prompt2_gtk.cc.
 
 #include <gtk/gtk.h>
 
 #include "base/string_util.h"
@@ skipping 50 matching lines @@
   // Build the dialog.
   dialog_ = gtk_dialog_new_with_buttons(
       l10n_util::GetStringUTF8(IDS_EXTENSION_UNINSTALL_PROMPT_TITLE).c_str(),
       browser_window->GetNativeHandle(),
       GTK_DIALOG_MODAL,
       GTK_STOCK_CANCEL,
       GTK_RESPONSE_CLOSE,
       l10n_util::GetStringUTF8(IDS_EXTENSION_PROMPT_UNINSTALL_BUTTON).c_str(),
       GTK_RESPONSE_ACCEPT,
       NULL);
+#if !GTK_CHECK_VERSION(2, 22, 0)
   gtk_dialog_set_has_separator(GTK_DIALOG(dialog_), FALSE);
+#endif
 
   // Create a two column layout.
   GtkWidget* content_area = gtk_dialog_get_content_area(GTK_DIALOG(dialog_));
   gtk_box_set_spacing(GTK_BOX(content_area), ui::kContentAreaSpacing);
 
   GtkWidget* icon_hbox = gtk_hbox_new(FALSE, ui::kContentAreaSpacing);
   gtk_box_pack_start(GTK_BOX(content_area), icon_hbox, TRUE, TRUE, 0);
 
   // Put Icon in the left column.
   GdkPixbuf* pixbuf = gfx::GdkPixbufFromSkBitmap(&icon_);
@@ skipping 40 matching lines @@
 }
 
 }  // namespace
 
 // static
 // Platform specific implementation of the uninstall dialog show method.
 ExtensionUninstallDialog* ExtensionUninstallDialog::Create(
     Profile* profile, Delegate* delegate) {
   return new ExtensionUninstallDialogGtk(profile, delegate);
 }