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

net/socket/ssl_client_socket.h

Index: net/socket/ssl_client_socket.h
diff --git a/net/socket/ssl_client_socket.h b/net/socket/ssl_client_socket.h
index 8f1284da896feb1345b61ba4ff11c05840cb1dae..14cf163de4c69cc414ceb12b94bf5ce15ee86250 100644
--- a/net/socket/ssl_client_socket.h
+++ b/net/socket/ssl_client_socket.h
@@ -88,6 +88,9 @@ class NET_EXPORT SSLClientSocket : public SSLSocket {
   virtual void GetSSLCertRequestInfo(
       SSLCertRequestInfo* cert_request_info) = 0;
 
+  // StreamSocket:
+  virtual NextProto GetNegotiatedProtocol() const OVERRIDE;
+
   // Get the application level protocol that we negotiated with the server.
   // *proto is set to the resulting protocol (n.b. that the string may have
   // embedded NULs).
@@ -123,8 +126,6 @@ class NET_EXPORT SSLClientSocket : public SSLSocket {
 
   virtual bool set_was_spdy_negotiated(bool negotiated);
 
-  virtual NextProto protocol_negotiated() const;
-
   virtual void set_protocol_negotiated(NextProto protocol_negotiated);
 
   // Returns the ServerBoundCertService used by this socket, or NULL if