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

third_party/WebKit/Source/core/svg/SVGNumberListTearOff.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 SVGNumberListTearOff final
     : public SVGListPropertyTearOffHelper<SVGNumberListTearOff, SVGNumberList>,
       public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static SVGNumberListTearOff* Create(
       SVGNumberList* target,
       SVGElement* context_element,
       PropertyIsAnimValType property_is_anim_val,
-      const QualifiedName& attribute_name = QualifiedName::Null()) {
+      const QualifiedName& attribute_name) {
     return new SVGNumberListTearOff(target, context_element,
                                     property_is_anim_val, attribute_name);
   }
 
   DEFINE_INLINE_VIRTUAL_TRACE_WRAPPERS() {
     visitor->TraceWrappers(contextElement());
   }
 
  private:
-  SVGNumberListTearOff(
-      SVGNumberList* target,
-      SVGElement* context_element,
-      PropertyIsAnimValType property_is_anim_val,
-      const QualifiedName& attribute_name = QualifiedName::Null())
+  SVGNumberListTearOff(SVGNumberList* target,
+                       SVGElement* context_element,
+                       PropertyIsAnimValType property_is_anim_val,
+                       const QualifiedName& attribute_name)
       : SVGListPropertyTearOffHelper<SVGNumberListTearOff, SVGNumberList>(
             target,
             context_element,
             property_is_anim_val,
             attribute_name) {}
 };
 
 }  // namespace blink
 
 #endif  // SVGNumberListTearOff_h