Oilpan: move SVG property hierarchy to the heap.

Source/platform/graphics/filters/SourceGraphic.h

 /*
  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 11 matching lines @@
 #ifndef SourceGraphic_h
 #define SourceGraphic_h
 
 #include "platform/graphics/DisplayList.h"
 #include "platform/graphics/filters/FilterEffect.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT SourceGraphic : public FilterEffect {
 public:
-    static PassRefPtr<SourceGraphic> create(Filter*);
+    static PassRefPtrWillBeRawPtr<SourceGraphic> create(Filter*);
 
     static const AtomicString& effectName();
 
     virtual FloatRect determineAbsolutePaintRect(const FloatRect& requestedRect) override;
 
     virtual FilterEffectType filterEffectType() const override { return FilterEffectTypeSourceInput; }
 
     virtual TextStream& externalRepresentation(TextStream&, int indention) const override;
     PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) override;
 
     void setDisplayList(PassRefPtr<DisplayList>);
 
 
 private:
     SourceGraphic(Filter* filter)
         : FilterEffect(filter)
     {
         setOperatingColorSpace(ColorSpaceDeviceRGB);
     }
 
     RefPtr<DisplayList> m_displayList;
 };
 
 } //namespace blink
 
 #endif // SourceGraphic_h