add previously focused node to WebClient::focusedNodeChanged

Source/core/page/Chrome.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012, Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 65 matching lines @@
     void setWindowRect(const FloatRect&) const;
     FloatRect windowRect() const;
 
     FloatRect pageRect() const;
 
     void focus() const;
 
     bool canTakeFocus(FocusType) const;
     void takeFocus(FocusType) const;
 
-    void focusedNodeChanged(Node*) const;
+    void focusedNodeChanged(Node*, Node*) const;
 
     void show(NavigationPolicy = NavigationPolicyIgnore) const;
 
     bool canRunModal() const;
     bool canRunModalNow() const;
     void runModal() const;
 
     void setWindowFeatures(const WindowFeatures&) const;
 
     bool toolbarsVisible() const;
@@ skipping 43 matching lines @@
     void notifyPopupOpeningObservers() const;
 
     Page* m_page;
     ChromeClient* m_client;
     Vector<PopupOpeningObserver*> m_popupOpeningObservers;
 };
 
 } // namespace blink
 
 #endif // Chrome_h