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..0877cbcf6cdc62d5e6f90233990eba71a2a19e74 100644
--- a/net/socket/ssl_client_socket_win.h
+++ b/net/socket/ssl_client_socket_win.h
@@ -46,14 +46,17 @@ class SSLClientSocketWin : public SSLClientSocket {
 
   // SSLClientSocket implementation.
   virtual void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info);
+  virtual NextProtoStatus GetNextProto(std::string* proto,
+                                       std::string* server_protos);
+  virtual ServerBoundCertService* GetServerBoundCertService() const OVERRIDE;
+
+  // SSLSocket implementation.
   virtual int ExportKeyingMaterial(const base::StringPiece& label,
                                    bool has_context,
                                    const base::StringPiece& context,
                                    unsigned char* out,
                                    unsigned int outlen);
-  virtual NextProtoStatus GetNextProto(std::string* proto,
-                                       std::string* server_protos);
-  virtual ServerBoundCertService* GetServerBoundCertService() const OVERRIDE;
+  virtual int GetTLSUniqueChannelBinding(std::string* out) OVERRIDE;
 
   // StreamSocket implementation.
   virtual int Connect(const CompletionCallback& callback) OVERRIDE;