Kill [SetWrapperReferenceFromReference] IDL extended attribute

Source/bindings/templates/interface.cpp

Index: Source/bindings/templates/interface.cpp
diff --git a/Source/bindings/templates/interface.cpp b/Source/bindings/templates/interface.cpp
index 7a52a835454614793d759fa1a00727b8ec181018..66a684a96a2d7fcab4c2f1d378322673f3a52dc5 100644
--- a/Source/bindings/templates/interface.cpp
+++ b/Source/bindings/templates/interface.cpp
@@ -678,7 +678,7 @@ static void constructor(const v8::FunctionCallbackInfo<v8::Value>& info)
 
 {##############################################################################}
 {% block visit_dom_wrapper %}
-{% if reachable_node_function or reachable_node_reference_function or
+{% if reachable_node_function or
       set_wrapper_reference_to_list %}
 void {{v8_class}}::visitDOMWrapper(void* object, const v8::Persistent<v8::Object>& wrapper, v8::Isolate* isolate)
 {
@@ -696,14 +696,13 @@ void {{v8_class}}::visitDOMWrapper(void* object, const v8::Persistent<v8::Object
     {% endfor %}
     {% endif %}
     {% if reachable_node_function %}
-    if (Node* owner = impl->{{reachable_node_function}}()) {
-        Node* root = V8GCController::opaqueRootForGC(owner, isolate);
+    // The {{reachable_node_function}}() method may return a reference or a pointer but
+    // RefPtr can be constructed from either.
+    if (RefPtr<Node> owner = PassRefPtr<Node>(impl->{{reachable_node_function}}())) {
+        Node* root = V8GCController::opaqueRootForGC(owner.get(), isolate);
         isolate->SetReferenceFromGroup(v8::UniqueId(reinterpret_cast<intptr_t>(root)), wrapper);
         return;
     }
-    {% elif reachable_node_reference_function %}
-    Node* root = V8GCController::opaqueRootForGC(&impl->{{reachable_node_reference_function}}(), isolate);
-    isolate->SetReferenceFromGroup(v8::UniqueId(reinterpret_cast<intptr_t>(root)), wrapper);
     {% endif %}
     {% if reachable_node_function or set_wrapper_reference_to_list %}
     setObjectGroup(object, wrapper, isolate);