Add a (non functional) gtk KeywordEditorWindow and hook it up in the relevant places.

chrome/browser/gtk/options/general_page_gtk.h

 // Copyright (c) 2006-2009 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.
 
 #ifndef CHROME_BROWSER_GTK_OPTIONS_GENERAL_PAGE_GTK_H_
 #define CHROME_BROWSER_GTK_OPTIONS_GENERAL_PAGE_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <string>
@@ skipping 105 matching lines @@
                                            GeneralPageGtk* general_page);
 
   // Callback for Show Home Button option
   static void OnShowHomeButtonToggled(GtkToggleButton* toggle_button,
                                       GeneralPageGtk* general_page);
 
   // Callback for default search engine selection
   static void OnDefaultSearchEngineChanged(GtkComboBox* combo_box,
                                            GeneralPageGtk* general_page);
 
+  // Callback for manage search engines button
+  static void OnDefaultSearchManageEnginesClicked(GtkButton* button,
+                                                  GeneralPageGtk* general_page);
+
   // Callback for use as default browser button
   static void OnBrowserUseAsDefaultClicked(GtkButton* button,
                                            GeneralPageGtk* general_page);
 
   // Enables/Disables the controls associated with the custom start pages
   // option if that preference is not selected.
   void EnableCustomHomepagesControls(bool enable);
 
   // Sets the UI state to match
   void SetDefaultBrowserUIState(bool is_default);
@@ skipping 42 matching lines @@
   CancelableRequestConsumer fav_icon_consumer_;
 
   // Default icon to show when one can't be found for the URL.  This is owned by
   // the ResourceBundle and we do not need to free it.
   GdkPixbuf* default_favicon_;
 
   DISALLOW_COPY_AND_ASSIGN(GeneralPageGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_OPTIONS_GENERAL_PAGE_GTK_H_