Add a new GetTlsUniqueChannelBinding method to SSLSocket, and implement nss version.

net/socket/ssl_client_socket_win.h

Index: net/socket/ssl_client_socket_win.h
diff --git a/net/socket/ssl_client_socket_win.h b/net/socket/ssl_client_socket_win.h
index f5c0a4db617583ed9e35822b359b8e21c7460ccf..db9534011d9bd94f29b0054069b3a0869537f41c 100644
--- a/net/socket/ssl_client_socket_win.h
+++ b/net/socket/ssl_client_socket_win.h
@@ -44,13 +44,18 @@ class SSLClientSocketWin : public SSLClientSocket {
                      const SSLClientSocketContext& context);
   ~SSLClientSocketWin();
 
-  // SSLClientSocket implementation.
-  virtual void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info);
+  // SSLSocket implementation.
   virtual int ExportKeyingMaterial(const base::StringPiece& label,
                                    bool has_context,
                                    const base::StringPiece& context,
                                    unsigned char* out,
                                    unsigned int outlen);
+  virtual int GetTlsUniqueChannelBinding(unsigned char* out,
+                                         unsigned int *outlen,
+                                         unsigned int outlen_max) OVERRIDE;
+
+  // SSLClientSocket implementation.
+  virtual void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info);
   virtual NextProtoStatus GetNextProto(std::string* proto,
                                        std::string* server_protos);
   virtual ServerBoundCertService* GetServerBoundCertService() const OVERRIDE;