Remove tons of OILPAN.

sky/engine/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 130 matching lines @@
     // Return this matrix skewed along the Y axis by the passed values.
     // Passing a NaN will use a value of 0.
     // Operation is performed as though the this matrix is multiplied by a matrix with
     // the skew values on the left (result = skewY(angle) * this)
     PassRefPtr<CSSMatrix> skewY(double angle) const;
 
     const TransformationMatrix& transform() const { return m_matrix; }
 
     String toString() const;
 
-    void trace(Visitor*) { }
-
 protected:
     CSSMatrix(const TransformationMatrix&);
     CSSMatrix(const String&, ExceptionState&);
 
     TransformationMatrix m_matrix;
 };
 
 } // namespace blink
 
 #endif // CSSMatrix_h