Fix the way <title> is read under <use> shadow tree

third_party/WebKit/Source/core/svg/SVGUseElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann
  * <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 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.
  *
@@ skipping 36 matching lines @@
   // Return the element that should be used for clipping,
   // or null if a valid clip element is not directly referenced.
   SVGGraphicsElement* visibleTargetGraphicsElementForClipping() 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(); }
 
   void buildPendingResource() override;
+  String title() const override;
 
   void dispatchPendingEvent();
   void toClipPath(Path&) const;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit SVGUseElement(Document&);
 
   void dispose();
@@ skipping 52 matching lines @@
   bool m_elementIdentifierIsLocal;
   bool m_haveFiredLoadEvent;
   bool m_needsShadowTreeRecreation;
   Member<SVGElement> m_targetElementInstance;
   Member<DocumentResource> m_resource;
 };
 
 }  // namespace blink
 
 #endif  // SVGUseElement_h