Fix index out of bounds bug which causes memory leak or browser crash in extension sessions API.

chrome/browser/extensions/api/sessions/sessions_api.cc

 // Copyright 2013 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/api/sessions/sessions_api.h"
 
 #include <vector>
 
 #include "base/i18n/rtl.h"
 #include "base/lazy_instance.h"
@@ skipping 211 matching lines @@
   return true;
 }
 
 scoped_ptr<tabs::Tab> SessionsGetDevicesFunction::CreateTabModel(
     const std::string& session_tag,
     const SessionTab& tab,
     int tab_index,
     int selected_index) {
   std::string session_id = SessionId(session_tag, tab.tab_id.id()).ToString();
   return CreateTabModelHelper(GetProfile(),
-                              tab.navigations[tab.current_navigation_index],
+                              tab.navigations[
+                                tab.normalized_navigation_index()],
                               session_id,
                               tab_index,
                               tab.pinned,
                               selected_index,
                               GetExtension());
 }
 
 scoped_ptr<windows::Window> SessionsGetDevicesFunction::CreateWindowModel(
         const SessionWindow& window, const std::string& session_tag) {
   DCHECK(!window.tabs.empty());
@@ skipping 327 matching lines @@
     SetInvalidIdError(*params->session_id);
     return false;
   }
 
   return session_id->IsForeign() ?
       RestoreForeignSession(*session_id, browser)
       : RestoreLocalSession(*session_id, browser);
 }
 
 }  // namespace extensions