revoke unused OAuth2 tokens on signout

google_apis/gaia/gaia_auth_consumer.h

 // Copyright (c) 2012 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 GOOGLE_APIS_GAIA_GAIA_AUTH_CONSUMER_H_
 #define GOOGLE_APIS_GAIA_GAIA_AUTH_CONSUMER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 54 matching lines @@
   virtual void OnClientLoginFailure(const GoogleServiceAuthError& error) {}
 
   virtual void OnIssueAuthTokenSuccess(const std::string& service,
                                        const std::string& auth_token) {}
   virtual void OnIssueAuthTokenFailure(const std::string& service,
                                        const GoogleServiceAuthError& error) {}
 
   virtual void OnClientOAuthSuccess(const ClientOAuthResult& result) {}
   virtual void OnClientOAuthFailure(const GoogleServiceAuthError& error) {}
 
+  virtual void OnOAuth2RevokeTokenCompleted() {}
+
   virtual void OnGetUserInfoSuccess(const UserInfoMap& data) {}
   virtual void OnGetUserInfoFailure(const GoogleServiceAuthError& error) {}
 
   virtual void OnUberAuthTokenSuccess(const std::string& token) {}
   virtual void OnUberAuthTokenFailure(const GoogleServiceAuthError& error) {}
 
   virtual void OnMergeSessionSuccess(const std::string& data) {}
   virtual void OnMergeSessionFailure(const GoogleServiceAuthError& error) {}
 };
 
 #endif  // GOOGLE_APIS_GAIA_GAIA_AUTH_CONSUMER_H_