Oilpan: disable conservative GCs during initial GC mixin construction.

Source/core/svg/SVGImageElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 17 matching lines @@
 #include "core/svg/SVGGraphicsElement.h"
 #include "core/svg/SVGImageLoader.h"
 #include "core/svg/SVGURIReference.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class SVGImageElement final : public SVGGraphicsElement,
                               public SVGURIReference {
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SVGImageElement);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN_NESTED(SVGImageElement, SVGGraphicsElement);
 public:
     DECLARE_NODE_FACTORY(SVGImageElement);
     DECLARE_VIRTUAL_TRACE();
 
     bool currentFrameHasSingleSecurityOrigin() const;
 
     SVGAnimatedLength* x() const { return m_x.get(); }
     SVGAnimatedLength* y() const { return m_y.get(); }
     SVGAnimatedLength* width() const { return m_width.get(); }
     SVGAnimatedLength* height() const { return m_height.get(); }
@@ skipping 31 matching lines @@
     RefPtrWillBeMember<SVGAnimatedLength> m_height;
     RefPtrWillBeMember<SVGAnimatedPreserveAspectRatio> m_preserveAspectRatio;
 
     OwnPtrWillBeMember<SVGImageLoader> m_imageLoader;
     bool m_needsLoaderURIUpdate : 1;
 };
 
 } // namespace blink
 
 #endif // SVGImageElement_h