Add a new GetNegotiatedProtocol method to StreamSocket and implement in all subclasses.

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 7f681faf379014afeb8c1144d5e033a99e7c3406..9fffab82b808bdd4f978631b419e7a4660d44dda 100644
--- a/net/socket/tcp_client_socket_win.h
+++ b/net/socket/tcp_client_socket_win.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -55,6 +55,7 @@ class NET_EXPORT TCPClientSocketWin : public StreamSocket,
   virtual bool UsingTCPFastOpen() const;
   virtual int64 NumBytesRead() const;
   virtual base::TimeDelta GetConnectTimeMicros() const;
+  virtual NextProto GetNegotiatedProtocol() const OVERRIDE;
 
   // Socket implementation.
   // Multiple outstanding requests are not supported.