Remove unused includes from core/accessibility, core/css and core/dom

Source/core/css/CSSMatrix.h

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CSSMatrix_h
 #define CSSMatrix_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/platform/graphics/transforms/TransformationMatrix.h"
 #include "wtf/RefCounted.h"
-#include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 typedef int ExceptionCode;
 
 class CSSMatrix : public ScriptWrappable, public RefCounted<CSSMatrix> {
 public:
     static PassRefPtr<CSSMatrix> create(const TransformationMatrix& m)
     {
@@ skipping 110 matching lines @@
 protected:
     CSSMatrix(const TransformationMatrix&);
     CSSMatrix(const String&, ExceptionCode&);
 
     TransformationMatrix m_matrix;
 };
 
 } // namespace WebCore
 
 #endif // CSSMatrix_h