Extracting NetLog inner classes into their own classes.

net/udp/udp_client_socket.h

Index: net/udp/udp_client_socket.h
diff --git a/net/udp/udp_client_socket.h b/net/udp/udp_client_socket.h
index 6381d3382655c19e16fd828571032b9582c3b193..bdca53e7c61605901013499eb07b06c69a47439d 100644
--- a/net/udp/udp_client_socket.h
+++ b/net/udp/udp_client_socket.h
@@ -9,13 +9,13 @@
 
 #include "base/macros.h"
 #include "net/base/rand_callback.h"
-#include "net/log/net_log.h"
 #include "net/udp/datagram_client_socket.h"
 #include "net/udp/udp_socket.h"
 
 namespace net {
 
-class NetLogWithSource;
+class NetLog;
+struct NetLogSource;
 
 // A client socket that uses UDP as the transport layer.
 class NET_EXPORT_PRIVATE UDPClientSocket : public DatagramClientSocket {
@@ -23,7 +23,7 @@ class NET_EXPORT_PRIVATE UDPClientSocket : public DatagramClientSocket {
   UDPClientSocket(DatagramSocket::BindType bind_type,
                   const RandIntCallback& rand_int_cb,
                   net::NetLog* net_log,
-                  const net::NetLog::Source& source);
+                  const net::NetLogSource& source);
   ~UDPClientSocket() override;
 
   // DatagramClientSocket implementation.