Fix test failures introduced by last revision.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index e542e4de3f46394a8cfdd6bff9c92a3fb669e7a7..43cf358d4fdeb195699866bef5503d39d8c9191c 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -385,9 +385,6 @@ static bool ArrayPrototypeHasNoElements(Heap* heap,
   // This method depends on non writability of Object and Array prototype
   // fields.
   if (array_proto->elements() != heap->empty_fixed_array()) return false;
-  // Hidden prototype
-  array_proto = JSObject::cast(array_proto->GetPrototype());
-  ASSERT(array_proto->elements() == heap->empty_fixed_array());
   // Object.prototype
   Object* proto = array_proto->GetPrototype();
   if (proto == heap->null_value()) return false;