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

chrome/browser/gtk/tabs/tab_strip_gtk.cc

 // 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.
 
 #include "chrome/browser/gtk/tabs/tab_strip_gtk.h"
 
 #include <algorithm>
 
 #include "app/gtk_dnd_util.h"
 #include "app/resource_bundle.h"
@@ skipping 1043 matching lines @@
       tab->StartMiniTabTitleAnimation();
     // We'll receive another notification of the change asynchronously.
     return;
   }
   tab->UpdateData(contents->tab_contents(),
                   model_->IsAppTab(index),
                   change_type == LOADING_ONLY);
   tab->UpdateFromModel();
 }
 
-void TabStripGtk::TabReplacedAt(TabContentsWrapper* old_contents,
+void TabStripGtk::TabReplacedAt(TabStripModel* tab_strip_model,
+                                TabContentsWrapper* old_contents,
                                 TabContentsWrapper* new_contents,
                                 int index) {
   TabChangedAt(new_contents, index, ALL);
 }
 
 void TabStripGtk::TabMiniStateChanged(TabContentsWrapper* contents, int index) {
   // Don't do anything if we've already picked up the change from TabMoved.
   if (GetTabAt(index)->mini() == model_->IsMiniTab(index))
     return;
 
@@ skipping 978 matching lines @@
 
   // Let the middle mouse button initiate clicks as well.
   gtk_util::SetButtonTriggersNavigation(button->widget());
   g_signal_connect(button->widget(), "clicked",
                    G_CALLBACK(OnNewTabClickedThunk), this);
   GTK_WIDGET_UNSET_FLAGS(button->widget(), GTK_CAN_FOCUS);
   gtk_fixed_put(GTK_FIXED(tabstrip_.get()), button->widget(), 0, 0);
 
   return button;
 }