Extracting NetLog inner classes into their own classes.

net/socket/transport_client_socket_unittest.cc

Index: net/socket/transport_client_socket_unittest.cc
diff --git a/net/socket/transport_client_socket_unittest.cc b/net/socket/transport_client_socket_unittest.cc
index 929e91c66cced07d15fb513adee195db5bafb595..7db6db470367f684a81c7bde0aed61380e8f202c 100644
--- a/net/socket/transport_client_socket_unittest.cc
+++ b/net/socket/transport_client_socket_unittest.cc
@@ -14,8 +14,9 @@
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/dns/mock_host_resolver.h"
-#include "net/log/net_log.h"
 #include "net/log/net_log_event_type.h"
+#include "net/log/net_log_source.h"
+#include "net/log/net_log_with_source.h"
 #include "net/log/test_net_log.h"
 #include "net/log/test_net_log_entry.h"
 #include "net/log/test_net_log_util.h"
@@ -103,7 +104,7 @@ void TransportClientSocketTest::SetUp() {
   ::testing::TestWithParam<ClientSocketTestTypes>::SetUp();
 
   // Open a server socket on an ephemeral port.
-  listen_sock_.reset(new TCPServerSocket(NULL, NetLog::Source()));
+  listen_sock_.reset(new TCPServerSocket(NULL, NetLogSource()));
   IPEndPoint local_address(IPAddress::IPv4Localhost(), 0);
   ASSERT_THAT(listen_sock_->Listen(local_address, 1), IsOk());
   // Get the server's address (including the actual port number).
@@ -125,7 +126,7 @@ void TransportClientSocketTest::SetUp() {
   rv = callback.WaitForResult();
   CHECK_EQ(rv, OK);
   sock_ = socket_factory_->CreateTransportClientSocket(addr, NULL, &net_log_,
-                                                       NetLog::Source());
+                                                       NetLogSource());
 }
 
 int TransportClientSocketTest::DrainClientSocket(