Remove const from createPopupMenu

Source/core/page/Chrome.cpp

 /*
  * Copyright (C) 2006, 2007, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 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 365 matching lines @@
 {
     m_page->animator().setAnimationFramePending();
     m_client->scheduleAnimationForFrame(localRoot);
 }
 
 bool Chrome::hasOpenedPopup() const
 {
     return m_client->hasOpenedPopup();
 }
 
-PassRefPtrWillBeRawPtr<PopupMenu> Chrome::createPopupMenu(LocalFrame& frame, PopupMenuClient* client) const
+PassRefPtrWillBeRawPtr<PopupMenu> Chrome::createPopupMenu(LocalFrame& frame, PopupMenuClient* client)
 {
     notifyPopupOpeningObservers();
     return m_client->createPopupMenu(frame, client);
 }
 
 void Chrome::registerPopupOpeningObserver(PopupOpeningObserver* observer)
 {
     ASSERT(observer);
     m_popupOpeningObservers.append(observer);
 }
@@ skipping 11 matching lines @@
     for (size_t i = 0; i < observers.size(); ++i)
         observers[i]->willOpenPopup();
 }
 
 void Chrome::willBeDestroyed()
 {
     m_client->chromeDestroyed();
 }
 
 } // namespace blink