ash: Use enum for SessionController::CycleActiveUser

chrome/browser/ui/ash/session_state_delegate_chromeos.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_UI_ASH_SESSION_STATE_DELEGATE_CHROMEOS_H_
 #define CHROME_BROWSER_UI_ASH_SESSION_STATE_DELEGATE_CHROMEOS_H_
 
 #include "ash/common/session/session_state_delegate.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
@@ skipping 25 matching lines @@
   bool ShouldLockScreenAutomatically() const override;
   void LockScreen() override;
   void UnlockScreen() override;
   bool IsUserSessionBlocked() const override;
   session_manager::SessionState GetSessionState() const override;
   const user_manager::UserInfo* GetUserInfo(
       ash::UserIndex index) const override;
   bool ShouldShowAvatar(ash::WmWindow* window) const override;
   gfx::ImageSkia GetAvatarImageForWindow(ash::WmWindow* window) const override;
   void SwitchActiveUser(const AccountId& account_id) override;
-  void CycleActiveUser(CycleUser cycle_user) override;
+  void CycleActiveUser(ash::CycleUserDirection direction) override;
   bool IsMultiProfileAllowedByPrimaryUserPolicy() const override;
   void AddSessionStateObserver(ash::SessionStateObserver* observer) override;
   void RemoveSessionStateObserver(ash::SessionStateObserver* observer) override;
 
   // chromeos::LoginState::Observer overrides.
   void LoggedInStateChanged() override;
 
   // user_manager::UserManager::UserSessionStateObserver:
   void ActiveUserChanged(const user_manager::User* active_user) override;
   void UserAddedToSession(const user_manager::User* added_user) override;
@@ skipping 18 matching lines @@
   // List of observers is only used on Chrome OS for now.
   base::ObserverList<ash::SessionStateObserver> session_state_observer_list_;
 
   // Session state (e.g. login screen vs. user session).
   session_manager::SessionState session_state_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionStateDelegateChromeos);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_SESSION_STATE_DELEGATE_CHROMEOS_H_