Clean up forward declarations in Source/core/rendering

Source/core/rendering/RenderLayerRepainter.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 32 matching lines @@
  */
 
 #ifndef RenderLayerRepainter_h
 #define RenderLayerRepainter_h
 
 #include "platform/geometry/LayoutRect.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
-class RenderLayer;
 class RenderLayerModelObject;
 
 class RenderLayerRepainter {
     WTF_MAKE_NONCOPYABLE(RenderLayerRepainter);
 public:
     RenderLayerRepainter(RenderLayerModelObject&);
 
     void paintInvalidationIncludingNonCompositingDescendants();
 
     void computePaintInvalidationRectsIncludingNonCompositingDescendants();
 
     // Indicate that the layer contents need to be repainted. Only has an effect
     // if layer compositing is being used,
     void setBackingNeedsPaintInvalidationInRect(const LayoutRect&); // r is in the coordinate space of the layer's render object
 
 private:
     void paintInvalidationIncludingNonCompositingDescendantsInternal(const RenderLayerModelObject* repaintContainer);
 
     RenderLayerModelObject& m_renderer;
 };
 
 } // namespace blink
 
 #endif // RenderLayerRepainter_h