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

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

 /*
  * 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 226 matching lines @@
 
 SVGLengthTearOff::SVGLengthTearOff(SVGLength* target,
                                    SVGElement* context_element,
                                    PropertyIsAnimValType property_is_anim_val,
                                    const QualifiedName& attribute_name)
     : SVGPropertyTearOff<SVGLength>(target,
                                     context_element,
                                     property_is_anim_val,
                                     attribute_name) {}
 
+SVGLengthTearOff* SVGLengthTearOff::CreateDetached() {
+  return Create(SVGLength::Create(), nullptr, kPropertyIsNotAnimVal,
+                QualifiedName::Null());
+}
+
 DEFINE_TRACE_WRAPPERS(SVGLengthTearOff) {
   visitor->TraceWrappers(contextElement());
 }
 
 }  // namespace blink