ash: Use enum for SessionController::CycleActiveUser

ash/mus/shell_delegate_mus.cc

 // Copyright 2016 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.
 
 #include "ash/mus/shell_delegate_mus.h"
 
 #include <utility>
 
 #include "ash/common/gpu_support_stub.h"
 #include "ash/common/palette_delegate.h"
@@ skipping 47 matching lines @@
   }
   bool ShouldShowAvatar(WmWindow* window) const override {
     NOTIMPLEMENTED();
     return !user_info_->GetImage().isNull();
   }
   gfx::ImageSkia GetAvatarImageForWindow(WmWindow* window) const override {
     NOTIMPLEMENTED();
     return gfx::ImageSkia();
   }
   void SwitchActiveUser(const AccountId& account_id) override {}
-  void CycleActiveUser(CycleUser cycle_user) override {}
+  void CycleActiveUser(CycleUserDirection direction) override {}
   bool IsMultiProfileAllowedByPrimaryUserPolicy() const override {
     return true;
   }
   void AddSessionStateObserver(ash::SessionStateObserver* observer) override {}
   void RemoveSessionStateObserver(
       ash::SessionStateObserver* observer) override {}
 
  private:
   bool screen_locked_;
 
@@ skipping 117 matching lines @@
 void ShellDelegateMus::SetTouchscreenEnabledInPrefs(bool enabled,
                                                     bool use_local_state) {
   NOTIMPLEMENTED();
 }
 
 void ShellDelegateMus::UpdateTouchscreenStatusFromPrefs() {
   NOTIMPLEMENTED();
 }
 
 }  // namespace ash