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

third_party/WebKit/Source/core/svg/properties/SVGPropertyTearOff.h

 /*
  * Copyright (C) 2013 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 58 matching lines @@
     attribute_name_ = attribute_name;
   }
 
   virtual AnimatedPropertyType GetType() const = 0;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}
 
   static void ThrowReadOnly(ExceptionState&);
 
  protected:
-  SVGPropertyTearOffBase(
-      SVGElement* context_element,
-      PropertyIsAnimValType property_is_anim_val,
-      const QualifiedName& attribute_name = QualifiedName::Null())
+  SVGPropertyTearOffBase(SVGElement* context_element,
+                         PropertyIsAnimValType property_is_anim_val,
+                         const QualifiedName& attribute_name)
       : context_element_(context_element),
         property_is_anim_val_(property_is_anim_val),
         attribute_name_(attribute_name) {}
 
  private:
   // This raw pointer is safe since the SVG element is guaranteed to be kept
   // alive by a V8 wrapper.
   // See http://crbug.com/528275 for the detail.
   UntracedMember<SVGElement> context_element_;
 
@@ skipping 16 matching lines @@
   AnimatedPropertyType GetType() const override {
     return Property::ClassType();
   }
 
   DEFINE_INLINE_VIRTUAL_TRACE() {
     visitor->Trace(target_);
     SVGPropertyTearOffBase::Trace(visitor);
   }
 
  protected:
-  SVGPropertyTearOff(
-      Property* target,
-      SVGElement* context_element,
-      PropertyIsAnimValType property_is_anim_val,
-      const QualifiedName& attribute_name = QualifiedName::Null())
+  SVGPropertyTearOff(Property* target,
+                     SVGElement* context_element,
+                     PropertyIsAnimValType property_is_anim_val,
+                     const QualifiedName& attribute_name)
       : SVGPropertyTearOffBase(context_element,
                                property_is_anim_val,
                                attribute_name),
         target_(target) {
     DCHECK(target_);
   }
 
  private:
   Member<Property> target_;
 };
 
 }  // namespace blink
 
 #endif  // SVGPropertyTearOff_h