Clean up creation of "detached" SVG* data type objects

third_party/WebKit/Source/core/svg/SVGStringListTearOff.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 28 matching lines @@
 
 class SVGStringListTearOff : public SVGPropertyTearOff<SVGStringList>,
                              public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static SVGStringListTearOff* Create(
       SVGStringList* target,
       SVGElement* context_element,
       PropertyIsAnimValType property_is_anim_val,
-      const QualifiedName& attribute_name = QualifiedName::Null()) {
+      const QualifiedName& attribute_name) {
     return new SVGStringListTearOff(target, context_element,
                                     property_is_anim_val, attribute_name);
   }
 
   // SVGStringList DOM interface:
 
   // WebIDL requires "unsigned long" type instead of size_t.
   unsigned long length() { return Target()->length(); }
 
   void clear(ExceptionState& exception_state) {
@@ skipping 75 matching lines @@
  protected:
   SVGStringListTearOff(SVGStringList*,
                        SVGElement*,
                        PropertyIsAnimValType,
                        const QualifiedName&);
 };
 
 }  // namespace blink
 
 #endif  // SVGStringListTearOff_h