InlinedVisitor: Migrate html to use inlined tracing

Source/core/html/canvas/CanvasGradient.h

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  *
  * 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
@@ skipping 36 matching lines @@
     }
     static PassRefPtrWillBeRawPtr<CanvasGradient> create(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1)
     {
         return adoptRefWillBeNoop(new CanvasGradient(p0, r0, p1, r1));
     }
 
     Gradient* gradient() const { return m_gradient.get(); }
 
     void addColorStop(float value, const String& color, ExceptionState&);
 
-    void trace(Visitor*) { }
+    DEFINE_INLINE_TRACE() { }
 
 private:
     CanvasGradient(const FloatPoint& p0, const FloatPoint& p1);
     CanvasGradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1);
 
     RefPtr<Gradient> m_gradient;
 };
 
 } // namespace blink
 
 #endif // CanvasGradient_h