Always invoke C++ ArrayPush builtin.

src/top.h

Index: src/top.h
diff --git a/src/top.h b/src/top.h
index ddc73ba55b98e255c53a9e01e98dfd4b70f43722..e20a2a0f137d5afcf4acfc7b843de93a4152c38b 100644
--- a/src/top.h
+++ b/src/top.h
@@ -342,11 +342,6 @@ class Top {
     return Handle<JSBuiltinsObject>(thread_local_.context_->builtins());
   }
 
-  static bool CanHaveSpecialFunctions(JSObject* object);
-  static Object* LookupSpecialFunction(JSObject* receiver,
-                                       JSObject* prototype,
-                                       JSFunction* value);
-
   static void RegisterTryCatchHandler(v8::TryCatch* that);
   static void UnregisterTryCatchHandler(v8::TryCatch* that);