diff --git a/src/factory.cc b/src/factory.cc
index ee5c37b..9728926 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -465,13 +465,13 @@
 }
 
 
-Handle<Map> Factory::GetExternalArrayElementsMap(
+Handle<Map> Factory::GetElementsTransitionMap(
     Handle<Map> src,
-    ExternalArrayType array_type,
+    ElementsKind elements_kind,
     bool safe_to_add_transition) {
   CALL_HEAP_FUNCTION(isolate(),
-                     src->GetExternalArrayElementsMap(array_type,
-                                                      safe_to_add_transition),
+                     src->GetElementsTransitionMap(elements_kind,
+                                                   safe_to_add_transition),
                      Map);
 }
 
@@ -922,10 +922,19 @@
 }
 
 
-void Factory::BecomeJSObject(Handle<JSProxy> object) {
+void Factory::BecomeJSObject(Handle<JSReceiver> object) {
   CALL_HEAP_FUNCTION_VOID(
       isolate(),
-      isolate()->heap()->ReinitializeJSProxyAsJSObject(*object));
+      isolate()->heap()->ReinitializeJSReceiver(
+          *object, JS_OBJECT_TYPE, JSObject::kHeaderSize));
+}
+
+
+void Factory::BecomeJSFunction(Handle<JSReceiver> object) {
+  CALL_HEAP_FUNCTION_VOID(
+      isolate(),
+      isolate()->heap()->ReinitializeJSReceiver(
+          *object, JS_FUNCTION_TYPE, JSFunction::kSize));
 }