Revert 111270 - Part 1 of work to do user sign in based on OAuth2:

chrome/common/net/gaia/gaia_urls.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 CHROME_COMMON_NET_GAIA_GAIA_URLS_H_
 #define CHROME_COMMON_NET_GAIA_GAIA_URLS_H_
 #pragma once
 
 #include <string>
 
@@ skipping 16 matching lines @@
   const std::string& get_oauth_token_url();
   const std::string& oauth_get_access_token_url();
   const std::string& oauth_wrap_bridge_url();
   const std::string& oauth_user_info_url();
   const std::string& oauth_revoke_token_url();
   const std::string& oauth1_login_url();
 
   const std::string& oauth1_login_scope();
   const std::string& oauth_wrap_bridge_user_info_scope();
 
-  const std::string& oauth2_chrome_client_id();
-  const std::string& oauth2_chrome_client_secret();
-  const std::string& client_login_to_oauth2_url();
-  const std::string& oauth2_token_url();
-
  private:
   GaiaUrls();
   ~GaiaUrls();
 
   friend struct DefaultSingletonTraits<GaiaUrls>;
 
   std::string captcha_url_prefix_;
 
   std::string gaia_origin_url_;
   std::string client_login_url_;
   std::string issue_auth_token_url_;
   std::string get_user_info_url_;
   std::string token_auth_url_;
   std::string merge_session_url_;
   std::string get_oauth_token_url_;
   std::string oauth_get_access_token_url_;
   std::string oauth_wrap_bridge_url_;
   std::string oauth_user_info_url_;
   std::string oauth_revoke_token_url_;
   std::string oauth1_login_url_;
 
   std::string oauth1_login_scope_;
   std::string oauth_wrap_bridge_user_info_scope_;
 
-  std::string oauth2_chrome_client_id_;
-  std::string oauth2_chrome_client_secret_;
-  std::string client_login_to_oauth2_url_;
-  std::string oauth2_token_url_;
-
   DISALLOW_COPY_AND_ASSIGN(GaiaUrls);
 };
 
 #endif  // CHROME_COMMON_NET_GAIA_GAIA_URLS_H_