Clean up forward declarations in Source/core

Source/core/editing/RenderedPosition.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef RenderedPosition_h
 #define RenderedPosition_h
 
 #include "core/editing/TextAffinity.h"
 #include "core/rendering/InlineBox.h"
 
 namespace blink {
 
-class GraphicsLayer;
 class LayoutUnit;
 class Position;
 class RenderObject;
 class VisiblePosition;
 struct CompositedSelectionBound;
 
 class RenderedPosition {
 public:
     RenderedPosition();
     explicit RenderedPosition(const VisiblePosition&);
@@ skipping 60 matching lines @@
     , m_prevLeafChild(uncachedInlineBox())
     , m_nextLeafChild(uncachedInlineBox())
 {
 }
 
 bool renderObjectContainsPosition(RenderObject*, const Position&);
 
 };
 
 #endif // RenderedPosition_h