Cleanup AuthenticatorMethod usage.

remoting/protocol/pairing_client_authenticator.h

 // Copyright 2013 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_PROTOCOL_PAIRING_CLIENT_AUTHENTICATOR_H_
 #define REMOTING_PROTOCOL_PAIRING_CLIENT_AUTHENTICATOR_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "remoting/protocol/pairing_authenticator_base.h"
 
 namespace remoting {
 namespace protocol {
 
 class PairingClientAuthenticator : public PairingAuthenticatorBase {
  public:
   PairingClientAuthenticator(
       const std::string& client_id,
       const std::string& paired_secret,
       const CreateBaseAuthenticatorCallback& create_base_authenticator_callback,
       const FetchSecretCallback& fetch_pin_callback,
-      const std::string& authentication_tag);
+      const std::string& host_id);
   ~PairingClientAuthenticator() override;
 
   // Authenticator interface.
   State state() const override;
 
  private:
   // PairingAuthenticatorBase overrides.
   void CreateSpakeAuthenticatorWithPin(
       State initial_state,
       const base::Closure& resume_callback) override;
   void AddPairingElements(buzz::XmlElement* message) override;
 
   void OnPinFetched(State initial_state,
                     const base::Closure& resume_callback,
                     const std::string& pin);
 
   // Protocol state.
   bool sent_client_id_ = false;
   std::string client_id_;
   std::string paired_secret_;
   CreateBaseAuthenticatorCallback create_base_authenticator_callback_;
   FetchSecretCallback fetch_pin_callback_;
-  std::string authentication_tag_;
+  std::string host_id_;
 
   // Set to true if a PIN-based authenticator has been requested but has not
   // yet been set.
   bool waiting_for_pin_ = false;
 
   base::WeakPtrFactory<PairingClientAuthenticator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PairingClientAuthenticator);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_PAIRING_AUTHENTICATOR_H_