ChromeOS: fix crash in TokenHandleFetcher destructor.

chrome/browser/chromeos/login/signin/token_handle_fetcher.h

 // Copyright 2015 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_SIGNIN_TOKEN_HANDLE_FETCHER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_TOKEN_HANDLE_FETCHER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
+#include "components/keyed_service/core/keyed_service_shutdown_notifier.h"
 #include "components/user_manager/user_id.h"
 #include "google_apis/gaia/gaia_oauth_client.h"
 #include "google_apis/gaia/oauth2_token_service.h"
 
 class TokenHandleUtil;
 class Profile;
 
 // This class is resposible for obtaining new token handle for user.
 // It can be used in two ways. When user have just used GAIA signin there is
 // an OAuth2 token available. If there is profile already loaded, then
@@ skipping 31 matching lines @@
 
   // GaiaOAuthClient::Delegate overrides:
   void OnOAuthError() override;
   void OnNetworkError(int response_code) override;
   void OnGetTokenInfoResponse(
       scoped_ptr<base::DictionaryValue> token_info) override;
 
   void RequestAccessToken(const std::string& account_id);
   void FillForAccessToken(const std::string& access_token);
 
+  // This is called before profile is detroyed.
+  void OnProfileDestroyed();
+
   TokenHandleUtil* token_handle_util_;
   user_manager::UserID user_id_;
   OAuth2TokenService* token_service_;
 
   bool waiting_for_refresh_token_;
   std::string account_without_token_;
   Profile* profile_;
   base::TimeTicks tokeninfo_response_start_time_;
   TokenFetchingCallback callback_;
   scoped_ptr<gaia::GaiaOAuthClient> gaia_client_;
   scoped_ptr<OAuth2TokenService::Request> oauth2_access_token_request_;
+  scoped_ptr<KeyedServiceShutdownNotifier::Subscription>
+      profile_shutdown_notification_;
 
   DISALLOW_COPY_AND_ASSIGN(TokenHandleFetcher);
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_TOKEN_HANDLE_FETCHER_H_