Mojo UDP socket API definition review.

mojo/services/public/interfaces/network/net_address.mojom

 // Copyright 2014 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.
 
 module mojo {
 
 enum NetAddressFamily {
   UNSPECIFIED,
   IPV4,
   IPV6
 };
 
 // All members are expressed in network byte order, i.e., the most significant
 // byte is stored in the smallest address. For example, if we store 127.0.0.1 in
 // |addr|, 127 should be at index 0.
 struct NetAddressIPv4 {
   uint16 port;
   uint8[4] addr;
 };
 
 // All members are expressed in network byte order.
 struct NetAddressIPv6 {
   uint16 port;
   uint8[16] addr;
 };
 
 struct NetAddress {
   NetAddressFamily family = UNSPECIFIED;
+
   // At most one of the following fields is non-NULL depending on the value of
   // |family|.
   NetAddressIPv4? ipv4;
   NetAddressIPv6? ipv6;
 };
 
 }