The "Update Chrome" menu item should appear in addition to the About menu.

chrome/browser/wrench_menu_model.h

 // Copyright (c) 2010 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_WRENCH_MENU_MODEL_H_
 #define CHROME_BROWSER_WRENCH_MENU_MODEL_H_
 #pragma once
 
 #include "app/menus/accelerator.h"
 #include "app/menus/button_menu_item_model.h"
@@ skipping 65 matching lines @@
  public:
   WrenchMenuModel(menus::AcceleratorProvider* provider, Browser* browser);
   virtual ~WrenchMenuModel();
 
   // Overridden for both ButtonMenuItemModel::Delegate and SimpleMenuModel:
   virtual bool IsLabelForCommandIdDynamic(int command_id) const;
   virtual string16 GetLabelForCommandId(int command_id) const;
   virtual void ExecuteCommand(int command_id);
   virtual bool IsCommandIdChecked(int command_id) const;
   virtual bool IsCommandIdEnabled(int command_id) const;
+  virtual bool IsCommandIdVisible(int command_id) const;
   virtual bool GetAcceleratorForCommandId(
       int command_id,
       menus::Accelerator* accelerator);
 
   // Overridden from TabStripModelObserver:
   virtual void TabSelectedAt(TabContents* old_contents,
                              TabContents* new_contents,
                              int index,
                              bool user_gesture);
   virtual void TabReplacedAt(TabContents* old_contents,
@@ skipping 20 matching lines @@
 
   // Adds custom items to the menu. Deprecated in favor of a cross platform
   // model for button items.
   void CreateCutCopyPaste();
   void CreateZoomFullscreen();
 
   // Gets the current zoom information from the renderer.
   double GetZoom(bool* enable_increment, bool* enable_decrement);
 
   string16 GetSyncMenuLabel() const;
-  string16 GetAboutEntryMenuLabel() const;
 
   // Models for the special menu items with buttons.
   scoped_ptr<menus::ButtonMenuItemModel> edit_menu_item_model_;
   scoped_ptr<menus::ButtonMenuItemModel> zoom_menu_item_model_;
 
   // Label of the zoom label in the zoom menu item.
   string16 zoom_label_;
 
   // Tools menu.
   scoped_ptr<ToolsMenuModel> tools_menu_model_;
 
   menus::AcceleratorProvider* provider_;  // weak
 
   Browser* browser_;  // weak
   TabStripModel* tabstrip_model_; // weak
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(WrenchMenuModel);
 };
 
 #endif  // CHROME_BROWSER_WRENCH_MENU_MODEL_H_