Correct handling of arrays with callbacks in the prototype chain.

src/transitions-inl.h

Index: src/transitions-inl.h
diff --git a/src/transitions-inl.h b/src/transitions-inl.h
index c4825fcf734a590dc6dbe114355fa3fc08fede2a..b9484417297412d7dddce7c6c389aec8c00c9a87 100644
--- a/src/transitions-inl.h
+++ b/src/transitions-inl.h
@@ -62,6 +62,11 @@ bool TransitionArray::HasElementsTransition() {
 }
 
 
+bool TransitionArray::HasElementCallbacksTransition() {
+  return Search(GetHeap()->element_callbacks_symbol()) != kNotFound;
+}
+
+
 Object* TransitionArray::back_pointer_storage() {
   return get(kBackPointerStorageIndex);
 }