Extracting NetLog inner classes into their own classes.

chrome/test/chromedriver/server/chromedriver_server.cc

Index: chrome/test/chromedriver/server/chromedriver_server.cc
diff --git a/chrome/test/chromedriver/server/chromedriver_server.cc b/chrome/test/chromedriver/server/chromedriver_server.cc
index 4abb1db5fa4ab2a55679037445f8894d486a15ed..b89a1dcb9e3211b61971ae1dc80e917d4bb91261 100644
--- a/chrome/test/chromedriver/server/chromedriver_server.cc
+++ b/chrome/test/chromedriver/server/chromedriver_server.cc
@@ -39,6 +39,7 @@
 #include "net/base/ip_address.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_errors.h"
+#include "net/log/net_log_source.h"
 #include "net/server/http_server.h"
 #include "net/server/http_server_request_info.h"
 #include "net/server/http_server_response_info.h"
@@ -76,7 +77,7 @@ class HttpServer : public net::HttpServer::Delegate {
 
   bool Start(uint16_t port, bool allow_remote) {
     std::unique_ptr<net::ServerSocket> server_socket(
-        new net::TCPServerSocket(NULL, net::NetLog::Source()));
+        new net::TCPServerSocket(NULL, net::NetLogSource()));
     if (ListenOnIPv4(server_socket.get(), port, allow_remote) != net::OK) {
       // This will work on an IPv6-only host, but we will be IPv4-only on
       // dual-stack hosts.