chromeos: Eliminate WmWindow from //ash/system

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/public/cpp/window_properties.h"
 #include "ash/root_window_controller.h"
@@ skipping 164 matching lines @@
   background_animator_.RemoveObserver(delegate_view_);
   background_animator_.RemoveObserver(this);
   Shell::Get()->focus_cycler()->RemoveWidget(this);
   SetFocusCycler(nullptr);
   RemoveObserver(this);
 }
 
 void ShelfWidget::CreateStatusAreaWidget(WmWindow* status_container) {
   DCHECK(status_container);
   DCHECK(!status_area_widget_);
-  status_area_widget_ = new StatusAreaWidget(status_container, wm_shelf_);
+  status_area_widget_ =
+      new StatusAreaWidget(status_container->aura_window(), wm_shelf_);
   status_area_widget_->CreateTrayViews();
   // NOTE: Container may be hidden depending on login/display state.
   status_area_widget_->Show();
   Shell::Get()->focus_cycler()->AddWidget(status_area_widget_);
   background_animator_.AddObserver(status_area_widget_);
   status_container->aura_window()->SetLayoutManager(
       new StatusAreaLayoutManager(this));
 }
 
 void ShelfWidget::SetPaintsBackground(ShelfBackgroundType background_type,
@@ skipping 130 matching lines @@
 void ShelfWidget::UpdateShelfItemBackground(SkColor color) {
   shelf_view_->UpdateShelfItemBackground(color);
 }
 
 void ShelfWidget::WillDeleteShelfLayoutManager() {
   shelf_layout_manager_->RemoveObserver(this);
   shelf_layout_manager_ = nullptr;
 }
 
 }  // namespace ash