Extracting NetLog inner classes into their own classes.

net/test/embedded_test_server/embedded_test_server_unittest.cc

Index: net/test/embedded_test_server/embedded_test_server_unittest.cc
diff --git a/net/test/embedded_test_server/embedded_test_server_unittest.cc b/net/test/embedded_test_server/embedded_test_server_unittest.cc
index 3919b98bd5d2790d6a8036cdb93c6a667be66611..31c66f4489c1d984c69b335d227b33cd9638bb59 100644
--- a/net/test/embedded_test_server/embedded_test_server_unittest.cc
+++ b/net/test/embedded_test_server/embedded_test_server_unittest.cc
@@ -18,6 +18,7 @@
 #include "crypto/nss_util.h"
 #include "net/base/test_completion_callback.h"
 #include "net/http/http_response_headers.h"
+#include "net/log/net_log_source.h"
 #include "net/log/test_net_log.h"
 #include "net/socket/client_socket_factory.h"
 #include "net/socket/stream_socket.h"
@@ -303,7 +304,7 @@ TEST_P(EmbeddedTestServerTest, ConnectionListenerAccept) {
 
   std::unique_ptr<StreamSocket> socket =
       ClientSocketFactory::GetDefaultFactory()->CreateTransportClientSocket(
-          address_list, NULL, &net_log, NetLog::Source());
+          address_list, NULL, &net_log, NetLogSource());
   TestCompletionCallback callback;
   ASSERT_THAT(callback.GetResult(socket->Connect(callback.callback())), IsOk());