Make LogoutButtonTray a regular View

ash/shelf/shelf_widget.cc

 // Copyright 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/shelf/shelf_widget.h"
 
 #include "ash/animation/animation_change_type.h"
 #include "ash/focus_cycler.h"
 #include "ash/root_window_controller.h"
 #include "ash/session/session_controller.h"
@@ skipping 203 matching lines @@
 
   opaque_foreground->SetOpacity(target_opacity);
 }
 
 bool ShelfWidget::IsShelfHiddenBehindBlackBar() const {
   return delegate_view_->opaque_foreground()->GetTargetOpacity() != 0.0f;
 }
 
 void ShelfWidget::OnShelfAlignmentChanged() {
   shelf_view_->OnShelfAlignmentChanged();
-  // TODO(jamescook): Status area should not cache alignment.
-  status_area_widget_->SetShelfAlignment(wm_shelf_->GetAlignment());
+  status_area_widget_->UpdateAfterShelfAlignmentChange();
   delegate_view_->SchedulePaint();
 }
 
 ShelfView* ShelfWidget::CreateShelfView() {
   DCHECK(!shelf_view_);
   shelf_view_ = new ShelfView(Shell::Get()->shelf_model(), wm_shelf_, this);
   shelf_view_->Init();
   GetContentsView()->AddChildView(shelf_view_);
   return shelf_view_;
 }
@@ skipping 112 matching lines @@
   if (shelf_view_)
     shelf_view_->UpdateShelfItemBackground(color);
 }
 
 void ShelfWidget::WillDeleteShelfLayoutManager() {
   shelf_layout_manager_->RemoveObserver(this);
   shelf_layout_manager_ = nullptr;
 }
 
 }  // namespace ash