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

chrome/browser/tabs/default_tab_handler.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_TABS_DEFAULT_TAB_HANDLER_H_
 #define CHROME_BROWSER_TABS_DEFAULT_TAB_HANDLER_H_
 #pragma once
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/tabs/tab_handler.h"
@@ skipping 53 matching lines @@
                             int index);
   virtual void TabDetachedAt(TabContentsWrapper* contents, int index);
   virtual void TabDeselectedAt(TabContentsWrapper* contents, int index);
   virtual void TabSelectedAt(TabContentsWrapper* old_contents,
                              TabContentsWrapper* new_contents,
                              int index,
                              bool user_gesture);
   virtual void TabMoved(TabContentsWrapper* contents,
                         int from_index,
                         int to_index);
-  virtual void TabReplacedAt(TabContentsWrapper* old_contents,
+  virtual void TabReplacedAt(TabStripModel* tab_strip_model,
+                             TabContentsWrapper* old_contents,
                              TabContentsWrapper* new_contents,
                              int index);
   virtual void TabPinnedStateChanged(TabContentsWrapper* contents, int index);
   virtual void TabStripEmpty();
 
  private:
   TabHandlerDelegate* delegate_;
 
   scoped_ptr<TabStripModel> model_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultTabHandler);
 };
 
 #endif  // CHROME_BROWSER_TABS_DEFAULT_TAB_HANDLER_H_