Remove ClientLogin support from remoting host

remoting/base/auth_token_util.h

-// Copyright (c) 2011 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.
-
-#ifndef REMOTING_BASE_AUTH_TOKEN_UTIL_H_
-#define REMOTING_BASE_AUTH_TOKEN_UTIL_H_
-
-#include <string>
-
-namespace remoting {
-
-// Given a string of the form "auth_service:auth_token" parses it into its
-// component pieces.
-void ParseAuthTokenWithService(const std::string& auth_service_with_token,
-                               std::string* auth_token,
-                               std::string* auth_service);
-
-}  // namespace remoting
-
-#endif  // REMOTING_BASE_AUTH_TOKEN_UTIL_H_