Extracting NetLog inner classes into their own classes.

net/dns/address_sorter_posix_unittest.cc

Index: net/dns/address_sorter_posix_unittest.cc
diff --git a/net/dns/address_sorter_posix_unittest.cc b/net/dns/address_sorter_posix_unittest.cc
index 78ba5b992d7826dfb6182d864661e0deda2a6bbd..203f76f0a52304efdc85f92a1723e4c30b802e1d 100644
--- a/net/dns/address_sorter_posix_unittest.cc
+++ b/net/dns/address_sorter_posix_unittest.cc
@@ -10,6 +10,7 @@
 #include "net/base/ip_address.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
+#include "net/log/net_log_with_source.h"
 #include "net/socket/client_socket_factory.h"
 #include "net/socket/socket_performance_watcher.h"
 #include "net/socket/ssl_client_socket.h"
@@ -106,7 +107,7 @@ class TestSocketFactory : public ClientSocketFactory {
       DatagramSocket::BindType,
       const RandIntCallback&,
       NetLog*,
-      const NetLog::Source&) override {
+      const NetLogSource&) override {
     return std::unique_ptr<DatagramClientSocket>(
         new TestUDPClientSocket(&mapping_));
   }
@@ -114,7 +115,7 @@ class TestSocketFactory : public ClientSocketFactory {
       const AddressList&,
       std::unique_ptr<SocketPerformanceWatcher>,
       NetLog*,
-      const NetLog::Source&) override {
+      const NetLogSource&) override {
     NOTIMPLEMENTED();
     return std::unique_ptr<StreamSocket>();
   }