Make LogoutButtonTray a regular View

ash/system/network/tray_vpn.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 ASH_SYSTEM_NETWORK_TRAY_VPN_H_
 #define ASH_SYSTEM_NETWORK_TRAY_VPN_H_
 
 #include <memory>
 
 #include "ash/system/network/tray_network_state_observer.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "base/macros.h"
 
 namespace ash {
 class TrayNetworkStateObserver;
 
 namespace tray {
 class NetworkDetailedView;
 class VpnDefaultView;
 }
 
 class TrayVPN : public SystemTrayItem,
                 public TrayNetworkStateObserver::Delegate {
  public:
   explicit TrayVPN(SystemTray* system_tray);
   ~TrayVPN() override;
 
   // SystemTrayItem
-  views::View* CreateTrayView(LoginStatus status) override;
   views::View* CreateDefaultView(LoginStatus status) override;
   views::View* CreateDetailedView(LoginStatus status) override;
-  void DestroyTrayView() override;
   void DestroyDefaultView() override;
   void DestroyDetailedView() override;
-  void UpdateAfterLoginStatusChange(LoginStatus status) override;
-  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override;
 
   // TrayNetworkStateObserver::Delegate
   void NetworkStateChanged() override;
 
  private:
   tray::VpnDefaultView* default_;
   tray::NetworkDetailedView* detailed_;
   std::unique_ptr<TrayNetworkStateObserver> network_state_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayVPN);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_NETWORK_TRAY_VPN_H_