Get rid of the ability to unregister preferences.

chrome/browser/chromeos/login/oauth2_login_manager.h

 // Copyright (c) 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 CHROME_BROWSER_CHROMEOS_LOGIN_OAUTH2_LOGIN_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_OAUTH2_LOGIN_MANAGER_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/login/oauth2_login_verifier.h"
 #include "chrome/browser/chromeos/login/oauth2_policy_fetcher.h"
 #include "chrome/browser/chromeos/login/oauth2_token_fetcher.h"
 #include "chrome/browser/chromeos/login/oauth_login_manager.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "net/url_request/url_request_context_getter.h"
 
 class GoogleServiceAuthError;
+class PrefRegistrySyncable;
 class Profile;
 class TokenService;
 
 namespace chromeos {
 
 // OAuth2 specialization of OAuthLoginManager.
 class OAuth2LoginManager : public OAuthLoginManager,
                            public content::NotificationObserver,
                            public OAuth2LoginVerifier::Delegate,
                            public OAuth2TokenFetcher::Delegate {
  public:
   explicit OAuth2LoginManager(OAuthLoginManager::Delegate* delegate);
   virtual ~OAuth2LoginManager();
 
+  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+
   // OAuthLoginManager overrides.
   virtual void RestorePolicyTokens(
       net::URLRequestContextGetter* auth_request_context) OVERRIDE;
   virtual void RestoreSession(
       Profile* user_profile,
       net::URLRequestContextGetter* auth_request_context,
       bool restore_from_auth_cookies) OVERRIDE;
   virtual void ContinueSessionRestore() OVERRIDE;
   virtual void Stop() OVERRIDE;
 
@@ skipping 22 matching lines @@
 
   // OAuth2TokenFetcher::Delegate overrides.
   virtual void OnOAuth2TokensAvailable(
       const GaiaAuthConsumer::ClientOAuthResult& oauth2_tokens) OVERRIDE;
   virtual void OnOAuth2TokensFetchFailed() OVERRIDE;
 
   // Retrieves TokenService for |user_profile_| and sets up notification
   // observer events.
   TokenService* SetupTokenService();
 
-  // Removes legacy tokens form OAuth1 flow.
+  // Removes legacy tokens from OAuth1 flow.
   void RemoveLegacyTokens();
 
   // Records OAuth2 tokens fetched through either policy fetcher or cookies-to-
   // token exchange into TokenService.
   void StoreOAuth2Tokens(
       const GaiaAuthConsumer::ClientOAuthResult& oauth2_tokens);
 
   // Loads previously stored OAuth2 tokens and kicks off its validation.
   void LoadAndVerifyOAuth2Tokens();
 
@@ skipping 28 matching lines @@
   scoped_ptr<OAuth2PolicyFetcher> oauth2_policy_fetcher_;
   // OAuth2 refresh token.
   std::string refresh_token_;
 
   DISALLOW_COPY_AND_ASSIGN(OAuth2LoginManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_OAUTH2_LOGIN_MANAGER_H_