Clean up forward declarations in Source/core/html

Source/core/html/shadow/MeterShadowElement.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 19 matching lines @@
 
 #ifndef MeterShadowElement_h
 #define MeterShadowElement_h
 
 #include "core/html/HTMLDivElement.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class HTMLMeterElement;
-class RenderMeter;
 
 class MeterShadowElement : public HTMLDivElement {
 protected:
     explicit MeterShadowElement(Document&);
     HTMLMeterElement* meterElement() const;
 
 private:
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE;
 };
 
@@ skipping 22 matching lines @@
     void updatePseudo() { setShadowPseudoId(valuePseudoId()); }
 
 private:
     explicit MeterValueElement(Document&);
     const AtomicString& valuePseudoId() const;
 };
 
 }
 
 #endif // MeterShadowElement_h