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

net/socket/socks_client_socket.cc

Index: net/socket/socks_client_socket.cc
diff --git a/net/socket/socks_client_socket.cc b/net/socket/socks_client_socket.cc
index b1f423f6282b2e0e6965ef8416aaeebfb0423e1a..c50fdd1880bc04262b3c85909f611b169c7e0bcb 100644
--- a/net/socket/socks_client_socket.cc
+++ b/net/socket/socks_client_socket.cc
@@ -180,6 +180,10 @@ base::TimeDelta SOCKSClientSocket::GetConnectTimeMicros() const {
   return base::TimeDelta::FromMicroseconds(-1);
 }
 
+NextProto SOCKSClientSocket::GetNegotiatedProtocol() const {
+  return kProtoUnknown;

[wtc, 2012/03/30 21:19:14]

I wonder if we should call transport_->socket()->GetNegotiatedProtocol()
here.

I guess we can wait until it is known to be necessary.

[Ryan Hamilton, 2012/03/30 21:53:17]

Done.
Nah, I think we might as well do it now.  Delegating to the transport socket is
correct.  (It's always on top of a TCP socket which returns kProtoUnknown)  

+}
+
 // Read is called by the transport layer above to read. This can only be done
 // if the SOCKS handshake is complete.
 int SOCKSClientSocket::Read(IOBuffer* buf, int buf_len,