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

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

Index: third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp b/third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp
index 2a29c263e215892c5538e0e61a955c9825476743..9145a353e798c42c2625fc38ea29165005bf4d7f 100644
--- a/third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp
@@ -244,6 +244,11 @@ SVGLengthTearOff::SVGLengthTearOff(SVGLength* target,
                                     property_is_anim_val,
                                     attribute_name) {}
 
+SVGLengthTearOff* SVGLengthTearOff::CreateDetached() {
+  return Create(SVGLength::Create(), nullptr, kPropertyIsNotAnimVal,
+                QualifiedName::Null());
+}
+
 DEFINE_TRACE_WRAPPERS(SVGLengthTearOff) {
   visitor->TraceWrappers(contextElement());
 }