Some more fixes to cros system tray icons (esp. screen tray items)

ash/common/system/user/tray_user_separator.h

 // Copyright 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 ASH_COMMON_SYSTEM_USER_TRAY_USER_SEPARATOR_H_
 #define ASH_COMMON_SYSTEM_USER_TRAY_USER_SEPARATOR_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "base/macros.h"
 
 namespace ash {
 
 // This tray item is showing an additional separator line between the logged in
 // users and the rest of the system tray menu. The separator will only be shown
 // when there are at least two users logged in.
 class ASH_EXPORT TrayUserSeparator : public SystemTrayItem {
  public:
   explicit TrayUserSeparator(SystemTray* system_tray);
   ~TrayUserSeparator() override {}
 
   // Returns true if the separator gets shown.
   bool separator_shown() { return separator_shown_; }
 
  private:
   // Overridden from SystemTrayItem.
   views::View* CreateDefaultView(LoginStatus status) override;
-  void DestroyTrayView() override {}
   void DestroyDefaultView() override;
-  void DestroyDetailedView() override {}
-  void UpdateAfterLoginStatusChange(LoginStatus status) override {}
-  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override {}
 
   // True if the separator gets shown.
   bool separator_shown_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayUserSeparator);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_USER_TRAY_USER_SEPARATOR_H_