Simplify SVGAnimated* initialization

third_party/WebKit/Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann
  * <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 49 matching lines @@
 using namespace SVGNames;
 
 SVGElement::SVGElement(const QualifiedName& tagName,
                        Document& document,
                        ConstructionType constructionType)
     : Element(tagName, &document, constructionType),
 #if ENABLE(ASSERT)
       m_inRelativeLengthClientsInvalidation(false),
 #endif
       m_SVGRareData(nullptr),
-      m_className(SVGAnimatedString::create(this,
-                                            HTMLNames::classAttr,
-                                            SVGString::create())) {
+      m_className(SVGAnimatedString::create(this, HTMLNames::classAttr)) {
   addToPropertyMap(m_className);
   setHasCustomStyleCallbacks();
 }
 
 SVGElement::~SVGElement() {
   ASSERT(isConnected() || !hasRelativeLengths());
 }
 
 void SVGElement::detachLayoutTree(const AttachContext& context) {
   Element::detachLayoutTree(context);
@@ skipping 1145 matching lines @@
   visitor->trace(m_className);
   Element::trace(visitor);
 }
 
 const AtomicString& SVGElement::eventParameterName() {
   DEFINE_STATIC_LOCAL(const AtomicString, evtString, ("evt"));
   return evtString;
 }
 
 }  // namespace blink