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

net/curvecp/curvecp_client_socket.h

Index: net/curvecp/curvecp_client_socket.h
diff --git a/net/curvecp/curvecp_client_socket.h b/net/curvecp/curvecp_client_socket.h
index 7d7a3613b0ce759ac4833efe96f72ec94c74ffbb..3c6eea631530020cda487b555eab0a41612af3f0 100644
--- a/net/curvecp/curvecp_client_socket.h
+++ b/net/curvecp/curvecp_client_socket.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.
 
@@ -39,6 +39,7 @@ class CurveCPClientSocket : public StreamSocket {
   virtual bool UsingTCPFastOpen() const OVERRIDE;
   virtual int64 NumBytesRead() const OVERRIDE;
   virtual base::TimeDelta GetConnectTimeMicros() const OVERRIDE;
+  virtual net::NextProto GetNegotiatedProtocol() const OVERRIDE;
 
   // Socket methods:
   virtual int Read(IOBuffer* buf,