Extracting NetLog inner classes into their own classes.

media/cast/test/utility/net_utility.cc

 // 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.
 
 #include "media/cast/test/utility/net_utility.h"
 
 #include <memory>
 
 #include "net/base/ip_address.h"
 #include "net/base/net_errors.h"
+#include "net/log/net_log_source.h"
 #include "net/udp/udp_server_socket.h"
 
 namespace media {
 namespace cast {
 namespace test {
 
 // TODO(hubbe): Move to /net/.
 net::IPEndPoint GetFreeLocalPort() {
   std::unique_ptr<net::UDPServerSocket> receive_socket(
-      new net::UDPServerSocket(NULL, net::NetLog::Source()));
+      new net::UDPServerSocket(NULL, net::NetLogSource()));
   receive_socket->AllowAddressReuse();
   CHECK_EQ(net::OK, receive_socket->Listen(
                         net::IPEndPoint(net::IPAddress::IPv4Localhost(), 0)));
   net::IPEndPoint endpoint;
   CHECK_EQ(net::OK, receive_socket->GetLocalAddress(&endpoint));
   return endpoint;
 }
 
 }  // namespace test
 }  // namespace cast
 }  // namespace media