Make TCPClientSocket* inherit from NonThreadSafe.

net/socket/tcp_client_socket_win.h

Index: net/socket/tcp_client_socket_win.h
diff --git a/net/socket/tcp_client_socket_win.h b/net/socket/tcp_client_socket_win.h
index 7e4eb8f07534771ecda191a59795b54b2bbf67cc..d1a2148b42b7c46f48fb347b275670762494034d 100644
--- a/net/socket/tcp_client_socket_win.h
+++ b/net/socket/tcp_client_socket_win.h
@@ -7,6 +7,7 @@
 
 #include <winsock2.h>
 
+#include "base/non_thread_safe.h"
 #include "base/object_watcher.h"
 #include "net/base/address_list.h"
 #include "net/base/completion_callback.h"
@@ -17,7 +18,7 @@ namespace net {
 
 class BoundNetLog;
 
-class TCPClientSocketWin : public ClientSocket {
+class TCPClientSocketWin : public ClientSocket, NonThreadSafe {
  public:
   // The IP address(es) and port number to connect to.  The TCP socket will try
   // each IP address in the list until it succeeds in establishing a