Oilpan: move SVG property hierarchy to the heap.

Source/core/rendering/style/StyleFilterData.cpp

 /*
  * Copyright (C) 2011 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 16 matching lines @@
 #include "core/rendering/style/StyleFilterData.h"
 
 namespace blink {
 
 StyleFilterData::StyleFilterData()
     : m_operations()
 {
 }
 
 StyleFilterData::StyleFilterData(const StyleFilterData& o)
-    : RefCounted<StyleFilterData>()
-    , m_operations(o.m_operations)
+    : m_operations(o.m_operations)
 {
 }
 
 bool StyleFilterData::operator==(const StyleFilterData& o) const
 {
     return m_operations == o.m_operations;
 }
 
 } // namespace blink