Reduce forward declarations in core/rendering

Source/core/rendering/RenderMarquee.h

 /*
  * Copyright (C) 2003 Apple Computer, Inc.
  *
  * 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>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 34 matching lines @@
 #define RenderMarquee_h
 
 #include "core/html/HTMLMarqueeElement.h"
 #include "core/rendering/RenderBlockFlow.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 #include "platform/Length.h"
 #include "platform/Timer.h"
 
 namespace WebCore {
 
-class RenderLayer;
-
 // This class handles the auto-scrolling for <marquee>
 class RenderMarquee FINAL : public RenderBlockFlow {
 public:
     explicit RenderMarquee(HTMLMarqueeElement*);
     virtual ~RenderMarquee();
 
     int speed() const { return m_speed; }
     int marqueeSpeed() const;
 
     EMarqueeDirection reverseDirection() const { return static_cast<EMarqueeDirection>(-direction()); }
@@ skipping 35 matching lines @@
     bool m_suspended : 1;
     bool m_stopped : 1;
     EMarqueeDirection m_direction : 4;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderMarquee, isMarquee());
 
 } // namespace WebCore
 
 #endif // RenderMarquee_h