Disable token handle fetching on some devices

chrome/browser/chromeos/login/existing_user_controller.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 CHROME_BROWSER_CHROMEOS_LOGIN_EXISTING_USER_CONTROLLER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_EXISTING_USER_CONTROLLER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 229 matching lines @@
   void OnBootstrapUserContextInitialized(bool success,
                                          const UserContext& user_context);
 
   // Callback invoked when |oauth2_token_initializer_| has finished.
   void OnOAuth2TokensFetched(bool success, const UserContext& user_context);
 
   // Callback invoked when |token_handle_util_| has finished.
   void OnTokenHandleObtained(const user_manager::UserID& id,
                              TokenHandleUtil::TokenHandleStatus status);
 
+  // Returns |true| if token handles should be used on this device.
+  bool TokenHandlesEnabled();
+
   // Public session auto-login timer.
   scoped_ptr<base::OneShotTimer<ExistingUserController> > auto_login_timer_;
 
   // Public session auto-login timeout, in milliseconds.
   int public_session_auto_login_delay_;
 
   // Username for public session auto-login.
   std::string public_session_auto_login_username_;
 
   // Used to execute login operations.
@@ skipping 81 matching lines @@
 
   // Factory of callbacks.
   base::WeakPtrFactory<ExistingUserController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExistingUserController);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_EXISTING_USER_CONTROLLER_H_