Make LogoutButtonTray a regular View

ash/system/tray/system_tray_item.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_TRAY_SYSTEM_TRAY_ITEM_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 83 matching lines @@
   virtual void DestroyDetailedView();
 
   // Updates the tray view (if applicable) when the user's login status changes.
   // It is not necessary the update the default or detailed view, since the
   // default/detailed popup is closed when login status changes. The default
   // implementation does nothing.
   virtual void UpdateAfterLoginStatusChange(LoginStatus status);
 
   // Updates the tray view (if applicable) when shelf's alignment changes.
   // The default implementation does nothing.
-  virtual void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment);
+  virtual void UpdateAfterShelfAlignmentChange();
 
   // Shows the detailed view for this item. If the main popup for the tray is
   // currently visible, then making this call would use the existing window to
   // display the detailed item. The detailed item will inherit the bounds of the
   // existing window.
   //
   // In Material Design the actual transition is intentionally delayed to allow
   // the user to perceive the ink drop animation on the clicked target.
   void TransitionDetailedView();
 
@@ skipping 35 matching lines @@
 
   // Used to delay the transition to the detailed view.
   base::OneShotTimer transition_delay_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_