move kInvalidNetAddress to constants file for split_link

ppapi/shared_impl/private/net_address_private_impl_constants.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ppapi/shared_impl/private/net_address_private_impl.h"
+
+#include "ppapi/c/private/ppb_net_address_private.h"
+
+namespace ppapi {
+
+#if !defined(OS_NACL)
+// static
+const PP_NetAddress_Private NetAddressPrivateImpl::kInvalidNetAddress = { 0 };
+#endif  // !defined(OS_NACL)
+
+}  // namespace ppapi