Simplify SVGAnimated* initialization

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

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 #include "core/svg/properties/SVGAnimatedProperty.h"
 
 namespace blink {
 
 class SVGAnimatedString : public SVGAnimatedProperty<SVGString>,
                           public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static SVGAnimatedString* create(SVGElement* contextElement,
-                                   const QualifiedName& attributeName,
-                                   SVGString* initialValue) {
-    return new SVGAnimatedString(contextElement, attributeName, initialValue);
+                                   const QualifiedName& attributeName) {
+    return new SVGAnimatedString(contextElement, attributeName);
   }
 
   virtual String baseVal();
   virtual void setBaseVal(const String&, ExceptionState&);
   virtual String animVal();
 
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  protected:
   SVGAnimatedString(SVGElement* contextElement,
-                    const QualifiedName& attributeName,
-                    SVGString* initialValue)
+                    const QualifiedName& attributeName)
       : SVGAnimatedProperty<SVGString>(contextElement,
                                        attributeName,
-                                       initialValue) {}
+                                       SVGString::create()) {}
 };
 
 }  // namespace blink
 
 #endif  // SVGAnimatedString_h