Fixes couple of bugs triggered on chromeos when restoring a tab:

chrome/browser/ui/ash/chrome_shell_delegate.h

 // Copyright (c) 2012 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_UI_ASH_CHROME_SHELL_DELEGATE_H_
 #define CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_
 
 #include <string>
 
 #include "ash/launcher/launcher_types.h"
@@ skipping 86 matching lines @@
   virtual ui::MenuModel* CreateContextMenu(aura::RootWindow* root) OVERRIDE;
   virtual ash::RootWindowHostFactory* CreateRootWindowHostFactory() OVERRIDE;
   virtual string16 GetProductName() const OVERRIDE;
 
   // content::NotificationObserver override:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
+  class TabRestoreHelper;
+
   void PlatformInit();
 
   // Returns the browser for active ash window if any. Otherwise it searches
   // for a browser or create one for default profile and returns it.
   Browser* GetTargetBrowser();
 
   static ChromeShellDelegate* instance_;
 
   content::NotificationRegistrar registrar_;
 
   scoped_ptr<ash::WindowPositioner> window_positioner_;
 
   base::WeakPtrFactory<ChromeShellDelegate> weak_factory_;
 
   ChromeLauncherController* launcher_delegate_;
 
+  scoped_ptr<TabRestoreHelper> tab_restore_helper_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeShellDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_