Kill [SetWrapperReferenceFromReference] IDL extended attribute

Source/bindings/tests/results/V8TestInterfacePython2.cpp

Index: Source/bindings/tests/results/V8TestInterfacePython2.cpp
diff --git a/Source/bindings/tests/results/V8TestInterfacePython2.cpp b/Source/bindings/tests/results/V8TestInterfacePython2.cpp
index 3c709173395a74d9a89375fa29abf6b7efd42c77..45623befd58bc93988d5470c481f234d4285fb5e 100644
--- a/Source/bindings/tests/results/V8TestInterfacePython2.cpp
+++ b/Source/bindings/tests/results/V8TestInterfacePython2.cpp
@@ -80,8 +80,10 @@ template <typename T> void V8_USE(T) { }
 void V8TestInterfacePython2::visitDOMWrapper(void* object, const v8::Persistent<v8::Object>& wrapper, v8::Isolate* isolate)
 {
     TestInterfacePython2* impl = fromInternalPointer(object);
-    if (Node* owner = impl->ownerNode()) {
-        Node* root = V8GCController::opaqueRootForGC(owner, isolate);
+    // The ownerNode() method may return a reference or a pointer but
+    // RefPtr can be constructed from either.
+    if (RefPtr<Node> owner = PassRefPtr<Node>(impl->ownerNode())) {
+        Node* root = V8GCController::opaqueRootForGC(owner.get(), isolate);
         isolate->SetReferenceFromGroup(v8::UniqueId(reinterpret_cast<intptr_t>(root)), wrapper);
         return;
     }