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

third_party/WebKit/Source/core/svg/SVGNumberTearOff.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 34 matching lines @@
 
 void SVGNumberTearOff::setValue(float f, ExceptionState& exception_state) {
   if (IsImmutable()) {
     ThrowReadOnly(exception_state);
     return;
   }
   Target()->SetValue(f);
   CommitChange();
 }
 
+SVGNumberTearOff* SVGNumberTearOff::CreateDetached() {
+  return Create(SVGNumber::Create(), nullptr, kPropertyIsNotAnimVal,
+                QualifiedName::Null());
+}
+
 DEFINE_TRACE_WRAPPERS(SVGNumberTearOff) {
   visitor->TraceWrappers(contextElement());
 }
 
 }  // namespace blink