Avoid branching in createAttributeEventListener

Source/core/svg/SVGElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Apple 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 164 matching lines @@
         ~InstanceUpdateBlocker();
 
     private:
         SVGElement* m_targetElement;
     };
 
     void invalidateInstances();
 
     virtual void trace(Visitor*) OVERRIDE;
 
+    static const AtomicString& eventParameterName();
+
 protected:
     SVGElement(const QualifiedName&, Document&, ConstructionType = CreateSVGElement);
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
     virtual void attributeChanged(const QualifiedName&, const AtomicString&, AttributeModificationReason = ModifiedDirectly) OVERRIDE;
 
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
     virtual void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, MutableStylePropertySet*) OVERRIDE;
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE;
@@ skipping 61 matching lines @@
     static bool equal(const QualifiedName& a, const QualifiedName& b) { return a.matches(b); }
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(SVGElement, isSVGElement());
 
 template <> inline bool isElementOfType<const SVGElement>(const Node& node) { return node.isSVGElement(); }
 
 }
 
 #endif