Oilpan: move SVG property hierarchy to the heap.

Source/platform/graphics/filters/ReferenceFilter.h

 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2013 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:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
@@ skipping 15 matching lines @@
  * TORT (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 ReferenceFilter_h
 #define ReferenceFilter_h
 
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/filters/Filter.h"
+#include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class SourceGraphic;
 class FilterEffect;
 
 class PLATFORM_EXPORT ReferenceFilter: public Filter {
 public:
-    static PassRefPtr<ReferenceFilter> create(float scale)
+    static PassRefPtrWillBeRawPtr<ReferenceFilter> create(float scale)
     {
-        return adoptRef(new ReferenceFilter(scale));
+        return adoptRefWillBeNoop(new ReferenceFilter(scale));
     }
 
+    virtual ~ReferenceFilter();
+    virtual void trace(Visitor*) override;
+
     virtual IntRect sourceImageRect() const override { return IntRect(); };
 
-    void setLastEffect(PassRefPtr<FilterEffect>);
+    void setLastEffect(PassRefPtrWillBeRawPtr<FilterEffect>);
     FilterEffect* lastEffect() const { return m_lastEffect.get(); }
 
     SourceGraphic* sourceGraphic() const { return m_sourceGraphic.get(); }
 
 private:
-    ReferenceFilter(float scale);
-    virtual ~ReferenceFilter();
+    explicit ReferenceFilter(float scale);
 
-    RefPtr<SourceGraphic> m_sourceGraphic;
-    RefPtr<FilterEffect> m_lastEffect;
+    RefPtrWillBeMember<SourceGraphic> m_sourceGraphic;
+    RefPtrWillBeMember<FilterEffect> m_lastEffect;
 };
 
 } // namespace blink
 
 #endif // ReferenceFilter_h