Remove const from createPopupMenu

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 109 matching lines @@
     PassOwnPtrWillBeRawPtr<ColorChooser> createColorChooser(LocalFrame*, ColorChooserClient*, const Color& initialColor);
     PassRefPtr<DateTimeChooser> openDateTimeChooser(DateTimeChooserClient*, const DateTimeChooserParameters&);
     void openTextDataListChooser(HTMLInputElement&);
 
     void runOpenPanel(LocalFrame*, PassRefPtr<FileChooser>);
     void enumerateChosenDirectory(FileChooser*);
 
     void dispatchViewportPropertiesDidChange(const ViewportDescription&) const;
 
     bool hasOpenedPopup() const;
-    PassRefPtrWillBeRawPtr<PopupMenu> createPopupMenu(LocalFrame&, PopupMenuClient*) const;
+    PassRefPtrWillBeRawPtr<PopupMenu> createPopupMenu(LocalFrame&, PopupMenuClient*);
 
     void registerPopupOpeningObserver(PopupOpeningObserver*);
     void unregisterPopupOpeningObserver(PopupOpeningObserver*);
 
     void willBeDestroyed();
 
 private:
     Chrome(Page*, ChromeClient*);
     void notifyPopupOpeningObservers() const;
 
     Page* m_page;
     ChromeClient* m_client;
     Vector<PopupOpeningObserver*> m_popupOpeningObservers;
 };
 
 } // namespace blink
 
 #endif // Chrome_h