Reduce forward declarations in core/svg

Source/core/svg/SVGInteger.h

 /*
  * Copyright (C) 2014 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 SVGInteger_h
 #define SVGInteger_h
 
 #include "bindings/v8/ExceptionMessages.h"
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/svg/properties/SVGProperty.h"
 
 namespace WebCore {
 
-class SVGIntegerTearOff;
-
 class SVGInteger : public SVGPropertyBase {
 public:
     typedef void TearOffType;
     typedef int PrimitiveType;
 
     static PassRefPtr<SVGInteger> create(int value = 0)
     {
         return adoptRef(new SVGInteger(value));
     }
 
@@ skipping 21 matching lines @@
 inline PassRefPtr<SVGInteger> toSVGInteger(PassRefPtr<SVGPropertyBase> passBase)
 {
     RefPtr<SVGPropertyBase> base = passBase;
     ASSERT(base->type() == SVGInteger::classType());
     return static_pointer_cast<SVGInteger>(base.release());
 }
 
 } // namespace WebCore
 
 #endif // SVGInteger_h