Make LogoutButtonTray a regular View

ash/system/user/tray_user.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_USER_TRAY_USER_H_
 #define ASH_SYSTEM_USER_TRAY_USER_H_
 
 #include "ash/ash_export.h"
 #include "ash/public/cpp/session_types.h"
 #include "ash/session/session_observer.h"
@@ skipping 49 matching lines @@
   tray::UserView* user_view_for_test() const { return user_; }
   tray::RoundedImageView* avatar_view_for_test() const { return avatar_; }
 
  private:
   // Overridden from SystemTrayItem.
   views::View* CreateTrayView(LoginStatus status) override;
   views::View* CreateDefaultView(LoginStatus status) override;
   void DestroyTrayView() override;
   void DestroyDefaultView() override;
   void UpdateAfterLoginStatusChange(LoginStatus status) override;
-  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override;
+  void UpdateAfterShelfAlignmentChange() override;
 
   // Overridden from SessionObserver.
   void OnActiveUserSessionChanged(const AccountId& account_id) override;
   void OnUserSessionAdded(const AccountId& account_id) override;
   void OnUserSessionUpdated(const AccountId& account_id) override;
 
   void UpdateAvatarImage(LoginStatus status);
 
   // Updates the layout of this item.
   void UpdateLayoutOfItem();
 
   ScopedSessionObserver scoped_session_observer_;
 
   // The user index to use.
   const UserIndex user_index_;
 
   tray::UserView* user_ = nullptr;
 
   // View that contains label and/or avatar.
   views::View* layout_view_ = nullptr;
   tray::RoundedImageView* avatar_ = nullptr;
   views::Label* label_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(TrayUser);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_USER_TRAY_USER_H_