Make LogoutButtonTray a regular View

ash/system/tray/system_tray_item.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/system/tray/system_tray_item.h"
 
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/tray_constants.h"
 #include "base/timer/timer.h"
@@ skipping 27 matching lines @@
 void SystemTrayItem::TransitionDetailedView() {
   transition_delay_timer_.Start(
       FROM_HERE,
       base::TimeDelta::FromMilliseconds(kTrayDetailedViewTransitionDelayMs),
       base::Bind(&SystemTray::ShowDetailedView, base::Unretained(system_tray()),
                  this, 0, true, BUBBLE_USE_EXISTING));
 }
 
 void SystemTrayItem::UpdateAfterLoginStatusChange(LoginStatus status) {}
 
-void SystemTrayItem::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
-}
+void SystemTrayItem::UpdateAfterShelfAlignmentChange() {}
 
 void SystemTrayItem::ShowDetailedView(int for_seconds, bool activate) {
   system_tray()->ShowDetailedView(this, for_seconds, activate,
                                   BUBBLE_CREATE_NEW);
 }
 
 void SystemTrayItem::SetDetailedViewCloseDelay(int for_seconds) {
   system_tray()->SetDetailedViewCloseDelay(for_seconds);
 }
 
 void SystemTrayItem::HideDetailedView(bool animate) {
   system_tray()->HideDetailedView(this, animate);
 }
 
 bool SystemTrayItem::ShouldShowShelf() const {
   return true;
 }
 
 }  // namespace ash