ash: Use enum for SessionController::CycleActiveUser

ash/common/session/session_state_delegate.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 ASH_COMMON_SESSION_SESSION_STATE_DELEGATE_H_
 #define ASH_COMMON_SESSION_SESSION_STATE_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/public/cpp/session_types.h"
 #include "components/session_manager/session_manager_types.h"
@@ skipping 11 matching lines @@
 namespace ash {
 
 class SessionStateObserver;
 class WmWindow;
 
 // Delegate for checking and modifying the session state.
 // DEPRECATED in favor of SessionController/SessionControllerClient for mash.
 // TODO(xiyuan): Remove this when SessionController etc are ready.
 class ASH_EXPORT SessionStateDelegate {
  public:
-  // Defines the cycle direction for |CycleActiveUser|.
-  enum CycleUser {
-    CYCLE_TO_NEXT_USER = 0,  // Cycle to the next user.
-    CYCLE_TO_PREVIOUS_USER,  // Cycle to the previous user.
-  };
-
   virtual ~SessionStateDelegate() {}
 
   // Returns the maximum possible number of logged in users.
   virtual int GetMaximumNumberOfLoggedInUsers() const = 0;
 
   // Returns the number of signed in users. If 0 is returned, there is either
   // no session in progress or no active user.
   virtual int NumberOfLoggedInUsers() const = 0;
 
   // Gets the policy of adding a user session to ash.
@@ skipping 39 matching lines @@
 
   // Returns the avatar image for the specified window.
   virtual gfx::ImageSkia GetAvatarImageForWindow(WmWindow* window) const = 0;
 
   // Switches to another active user with |account_id|
   // (if that user has already signed in).
   virtual void SwitchActiveUser(const AccountId& account_id) = 0;
 
   // Switches the active user to the next or previous user, with the same
   // ordering as GetLoggedInUsers.
-  virtual void CycleActiveUser(CycleUser cycle_user) = 0;
+  virtual void CycleActiveUser(CycleUserDirection direction) = 0;
 
   // Returns true if primary user policy does not forbid multiple signin.
   virtual bool IsMultiProfileAllowedByPrimaryUserPolicy() const = 0;
 
   // Adds or removes sessions state observer.
   virtual void AddSessionStateObserver(SessionStateObserver* observer) = 0;
   virtual void RemoveSessionStateObserver(SessionStateObserver* observer) = 0;
 
   bool IsInSecondaryLoginScreen() const;
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SESSION_SESSION_STATE_DELEGATE_H_