Re-add "ip_address" field to Mac MDNS response fields.

chrome/browser/local_discovery/service_discovery_client_mac.mm

 // Copyright 2013 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 "chrome/browser/local_discovery/service_discovery_client_mac.h"
 
 #import <arpa/inet.h>
 #import <Foundation/Foundation.h>
 #import <net/if_dl.h>
 
@@ skipping 334 matching lines @@
   service_description_.service_name = service_name_;
 
   for (NSData* address in [service_ addresses]) {
     const void* bytes = [address bytes];
     int length = [address length];
     const sockaddr* socket = static_cast<const sockaddr*>(bytes);
     net::IPEndPoint end_point;
     if (end_point.FromSockAddr(socket, length)) {
       service_description_.address =
           net::HostPortPair::FromIPEndPoint(end_point);
+      service_description_.ip_address = end_point.address();
       break;
     }
   }
 
   if (service_description_.address.host().empty()) {
     VLOG(1) << "Service IP is not resolved: " << service_name_;
     callback_runner_->PostTask(
         FROM_HERE,
         base::Bind(callback_, STATUS_KNOWN_NONEXISTENT, ServiceDescription()));
     return;
@@ skipping 115 matching lines @@
   container_->OnResolveUpdate(local_discovery::ServiceResolver::STATUS_SUCCESS);
 }
 
 - (void)netService:(NSNetService *)sender
         didNotResolve:(NSDictionary *)errorDict {
   container_->OnResolveUpdate(
       local_discovery::ServiceResolver::STATUS_REQUEST_TIMEOUT);
 }
 
 @end