Remove all of WebCore/platform/mac which is not mentioned in WebCore.gypi.

Source/WebCore/platform/mac/PopupMenuMac.h

-/*
- * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
- *
- * 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.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifndef PopupMenuMac_h
-#define PopupMenuMac_h
-
-#include "IntRect.h"
-#include "PopupMenu.h"
-#include <wtf/PassRefPtr.h>
-#include <wtf/RefCounted.h>
-#include <wtf/RetainPtr.h>
-
-OBJC_CLASS NSPopUpButtonCell;
-
-namespace WebCore {
-
-class PopupMenuClient;
-class FrameView;
-class Scrollbar;
-
-class PopupMenuMac : public PopupMenu {
-public:
-    PopupMenuMac(PopupMenuClient*);
-    ~PopupMenuMac();
-
-    virtual void show(const IntRect&, FrameView*, int index);
-    virtual void hide();
-    virtual void updateFromElement();
-    virtual void disconnectClient();
-
-private:
-    void clear();
-    void populate();
-    PopupMenuClient* client() const { return m_popupClient; }
-
-    PopupMenuClient* m_popupClient;
-    RetainPtr<NSPopUpButtonCell> m_popup;
-};
-
-}
-
-#endif // PopupMenuMac_h