Make forward/backward navigation work even when redirection is involved.

chrome/browser/tab_contents/navigation_controller.h

 // Copyright (c) 2006-2008 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_TAB_CONTENTS_NAVIGATION_CONTROLLER_H_
 #define CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_CONTROLLER_H_
 
 #include <map>
 
 #include "build/build_config.h"
@@ skipping 406 matching lines @@
   void set_max_restored_page_id(int max_id) { max_restored_page_id_ = max_id; }
 
   NavigationEntry* CreateNavigationEntry(const GURL& url, const GURL& referrer,
                                          PageTransition::Type transition);
 
   // Invoked after session/tab restore or cloning a tab. Resets the transition
   // type of the entries, updates the max page id and creates the active
   // contents.
   void FinishRestore(int selected_index);
 
-  // Inserts an entry after the current position, removing all entries after it.
-  // The new entry will become the active one.
-  void InsertEntry(NavigationEntry* entry);
+  // Inserts a new entry or replaces the current entry with a new one, removing
+  // all entries after it. The new entry will become the active one.
+  void InsertOrReplaceEntry(NavigationEntry* entry, bool replace);
 
   // Discards the pending and transient entries.
   void DiscardNonCommittedEntriesInternal();
 
   // Discards the transient entry.
   void DiscardTransientEntry();
 
   // ---------------------------------------------------------------------------
 
   // The user profile associated with this controller
@@ skipping 57 matching lines @@
   // when testing.
   static bool check_for_repost_;
 
   // The maximum number of entries that a navigation controller can store.
   static size_t max_entry_count_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationController);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_CONTROLLER_H_