Remove const from createPopupMenu

Source/core/loader/EmptyClients.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 57 matching lines @@
 }
 
 class EmptyPopupMenu : public PopupMenu {
 public:
     virtual void show(const FloatQuad&, const IntSize&, int) override { }
     virtual void hide() override { }
     virtual void updateFromElement() override { }
     virtual void disconnectClient() override { }
 };
 
-PassRefPtrWillBeRawPtr<PopupMenu> EmptyChromeClient::createPopupMenu(LocalFrame&, PopupMenuClient*) const
+PassRefPtrWillBeRawPtr<PopupMenu> EmptyChromeClient::createPopupMenu(LocalFrame&, PopupMenuClient*)
 {
     return adoptRefWillBeNoop(new EmptyPopupMenu());
 }
 
 PassOwnPtrWillBeRawPtr<ColorChooser> EmptyChromeClient::createColorChooser(LocalFrame*, ColorChooserClient*, const Color&)
 {
     return nullptr;
 }
 
 PassRefPtr<DateTimeChooser> EmptyChromeClient::openDateTimeChooser(DateTimeChooserClient*, const DateTimeChooserParameters&)
@@ skipping 69 matching lines @@
 {
     return nullptr;
 }
 
 PassOwnPtr<StorageNamespace> EmptyStorageClient::createSessionStorageNamespace()
 {
     return nullptr;
 }
 
 }