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

jingle/glue/pseudotcp_adapter.h

Index: jingle/glue/pseudotcp_adapter.h
diff --git a/jingle/glue/pseudotcp_adapter.h b/jingle/glue/pseudotcp_adapter.h
index 91811e93c6351a8d4bde6199893f1f3d67bccd40..b112fec56c9fae87d210f63a92929b5c38690c6f 100644
--- a/jingle/glue/pseudotcp_adapter.h
+++ b/jingle/glue/pseudotcp_adapter.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.
 
@@ -51,6 +51,7 @@ class PseudoTcpAdapter : public net::StreamSocket, base::NonThreadSafe {
   virtual bool UsingTCPFastOpen() const OVERRIDE;
   virtual int64 NumBytesRead() const OVERRIDE;
   virtual base::TimeDelta GetConnectTimeMicros() const OVERRIDE;
+  virtual net::NextProto GetNegotiatedProtocol() const OVERRIDE;
 
   // Set the delay for sending ACK.
   void SetAckDelay(int delay_ms);