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

chrome/browser/extensions/extension_browser_event_router.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/extensions/extension_browser_event_router.h"
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_event_names.h"
 #include "chrome/browser/extensions/extension_event_router.h"
@@ skipping 448 matching lines @@
   }
 }
 
 void ExtensionBrowserEventRouter::TabChangedAt(TabContentsWrapper* contents,
                                                int index,
                                                TabChangeType change_type) {
   TabUpdated(contents->tab_contents(), false);
 }
 
 void ExtensionBrowserEventRouter::TabReplacedAt(
+    TabStripModel* tab_strip_model,
     TabContentsWrapper* old_contents,
     TabContentsWrapper* new_contents,
     int index) {
-  UnregisterForTabNotifications(old_contents->tab_contents());
-  RegisterForTabNotifications(new_contents->tab_contents());
+  TabClosingAt(tab_strip_model, old_contents, index);
+  TabInsertedAt(new_contents, index,
+                tab_strip_model->selected_index() == index);
 }
 
 void ExtensionBrowserEventRouter::TabPinnedStateChanged(
     TabContentsWrapper* contents,
     int index) {
   TabStripModel* tab_strip = NULL;
   int tab_index;
 
   if (ExtensionTabUtil::GetTabStripModel(
         contents->tab_contents(), &tab_strip, &tab_index)) {
@@ skipping 48 matching lines @@
 
 void ExtensionBrowserEventRouter::BrowserActionExecuted(
     Profile* profile, const std::string& extension_id, Browser* browser) {
   TabContentsWrapper* tab_contents = NULL;
   int tab_id = 0;
   if (!ExtensionTabUtil::GetDefaultTab(browser, &tab_contents, &tab_id))
     return;
   DispatchEventWithTab(profile, extension_id, "browserAction.onClicked",
                        tab_contents->tab_contents());
 }