ash: Use enum for SessionController::CycleActiveUser

ash/shell/shell_delegate_impl.cc

 // 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.
 
 #include "ash/shell/shell_delegate_impl.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/default_accessibility_delegate.h"
 #include "ash/common/gpu_support_stub.h"
 #include "ash/common/palette_delegate.h"
@@ skipping 84 matching lines @@
   const user_manager::UserInfo* GetUserInfo(UserIndex index) const override {
     return user_info_.get();
   }
   bool ShouldShowAvatar(WmWindow* window) const override {
     return !user_info_->GetImage().isNull();
   }
   gfx::ImageSkia GetAvatarImageForWindow(WmWindow* window) const override {
     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(SessionStateObserver* observer) override {}
   void RemoveSessionStateObserver(SessionStateObserver* observer) override {}
 
  private:
   bool screen_locked_;
 
   // A pseudo user info.
@@ skipping 94 matching lines @@
   return true;
 }
 
 void ShellDelegateImpl::SetTouchscreenEnabledInPrefs(bool enabled,
                                                      bool use_local_state) {}
 
 void ShellDelegateImpl::UpdateTouchscreenStatusFromPrefs() {}
 
 }  // namespace shell
 }  // namespace ash