Oilpan: Ensure that classes with virtual trace methods always have vtables for their left-most base…

Source/core/svg/SVGFontFaceUriElement.h

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 20 matching lines @@
 class CSSFontFaceSrcValue;
 
 class SVGFontFaceUriElement FINAL : public SVGElement, public FontResourceClient {
 public:
     DECLARE_NODE_FACTORY(SVGFontFaceUriElement);
 
     virtual ~SVGFontFaceUriElement();
 
     PassRefPtrWillBeRawPtr<CSSFontFaceSrcValue> srcValue() const;
 
+    virtual void trace(Visitor* visitor) OVERRIDE
+    {
+        SVGElement::trace(visitor);
+        FontResourceClient::trace(visitor);
+    }
+
 private:
     explicit SVGFontFaceUriElement(Document&);
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual void childrenChanged(const ChildrenChange&) OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
 
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE { return false; }
 
     void loadFont();
 
     ResourcePtr<FontResource> m_resource;
 };
 
 } // namespace blink
 
 #endif // ENABLE(SVG_FONTS)
 #endif
 
 // vim:ts=4:noet