Changes instant so that the newly created tab has a new id. Doing

chrome/browser/ui/toolbar/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_UI_TOOLBAR_WRENCH_MENU_MODEL_H_
 #define CHROME_BROWSER_UI_TOOLBAR_WRENCH_MENU_MODEL_H_
 #pragma once
 
 #include "app/menus/accelerator.h"
 #include "app/menus/button_menu_item_model.h"
@@ skipping 80 matching lines @@
   virtual bool IsCommandIdVisible(int command_id) const;
   virtual bool GetAcceleratorForCommandId(
       int command_id,
       menus::Accelerator* accelerator);
 
   // Overridden from TabStripModelObserver:
   virtual void TabSelectedAt(TabContentsWrapper* old_contents,
                              TabContentsWrapper* new_contents,
                              int index,
                              bool user_gesture);
-  virtual void TabReplacedAt(TabContentsWrapper* old_contents,
-                             TabContentsWrapper* new_contents, int index);
+  virtual void TabReplacedAt(TabStripModel* tab_strip_model,
+                             TabContentsWrapper* old_contents,
+                             TabContentsWrapper* new_contents,
+                             int index);
   virtual void TabStripModelDeleted();
 
   // Overridden from NotificationObserver:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   // Getters.
   Browser* browser() const { return browser_; }
 
@@ skipping 28 matching lines @@
 
   Browser* browser_;  // weak
   TabStripModel* tabstrip_model_; // weak
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(WrenchMenuModel);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_WRENCH_MENU_MODEL_H_