Remove const from createPopupMenu

Source/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 178 matching lines @@
 
     virtual void clearCompositedSelectionBounds() { }
     virtual void updateCompositedSelectionBounds(const CompositedSelectionBound& anchor, const CompositedSelectionBound& focus) { }
 
     virtual void needTouchEvents(bool) = 0;
 
     virtual void setTouchAction(TouchAction) = 0;
 
     // Checks if there is an opened popup, called by RenderMenuList::showPopup().
     virtual bool hasOpenedPopup() const = 0;
-    virtual PassRefPtrWillBeRawPtr<PopupMenu> createPopupMenu(LocalFrame&, PopupMenuClient*) const = 0;
+    virtual PassRefPtrWillBeRawPtr<PopupMenu> createPopupMenu(LocalFrame&, PopupMenuClient*) = 0;
     virtual DOMWindow* pagePopupWindowForTesting() const = 0;
 
     virtual void postAccessibilityNotification(AXObject*, AXObjectCache::AXNotification) { }
     virtual String acceptLanguages() = 0;
 
     enum DialogType {
         AlertDialog = 0,
         ConfirmDialog = 1,
         PromptDialog = 2,
         HTMLDialog = 3
@@ skipping 20 matching lines @@
     virtual void didUpdateTextOfFocusedElementByNonUserInput() { }
     virtual void showImeIfNeeded() { }
 
 protected:
     virtual ~ChromeClient() { }
 };
 
 } // namespace blink
 
 #endif // ChromeClient_h