Remove ~1750 superfluous includes from core

Source/core/rendering/RenderListBox.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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 31 matching lines @@
 #include "core/html/HTMLOptGroupElement.h"
 #include "core/html/HTMLOptionElement.h"
 #include "core/html/HTMLSelectElement.h"
 #include "core/page/EventHandler.h"
 #include "core/page/FocusController.h"
 #include "core/page/Frame.h"
 #include "core/page/FrameView.h"
 #include "core/page/Page.h"
 #include "core/page/SpatialNavigation.h"
 #include "core/platform/Scrollbar.h"
-#include "core/platform/ScrollbarTheme.h"
 #include "core/platform/graphics/FontCache.h"
 #include "core/platform/graphics/GraphicsContext.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/PaintInfo.h"
-#include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderScrollbar.h"
 #include "core/rendering/RenderText.h"
 #include "core/rendering/RenderTheme.h"
 #include "core/rendering/RenderView.h"
 
 using namespace std;
 
 namespace WebCore {
 
 using namespace HTMLNames;
@@ skipping 819 matching lines @@
 
     if (m_vBar)
         m_vBar->styleChanged();
 
     // Force an update since we know the scrollbars have changed things.
     if (document()->hasAnnotatedRegions())
         document()->setAnnotatedRegionsDirty(true);
 }
 
 } // namespace WebCore