Clean up forward declarations in Source/platform

Source/platform/PopupMenu.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 PopupMenu_h
 #define PopupMenu_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class FloatQuad;
-class FrameView;
-class IntRect;
 class IntSize;
 
 class PopupMenu : public RefCounted<PopupMenu> {
 public:
     virtual ~PopupMenu() { }
     virtual void show(const FloatQuad& controlPosition, const IntSize& controlSize, int index) = 0;
     virtual void hide() = 0;
     virtual void updateFromElement() = 0;
     virtual void disconnectClient() = 0;
 };
 
 }
 
 #endif // PopupMenu_h