mash: Move SystemTrayDelegate ownership to WmShell

ash/system/status_area_widget.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/status_area_widget.h"
 
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/wm_root_window_controller.h"
+#include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/system/overview/overview_button_tray.h"
 #include "ash/system/status_area_widget_delegate.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/web_notification/web_notification_tray.h"
 #include "ash/wm/window_properties.h"
@@ skipping 36 matching lines @@
 
 void StatusAreaWidget::CreateTrayViews() {
   AddOverviewButtonTray();
   AddSystemTray();
   AddWebNotificationTray();
 #if defined(OS_CHROMEOS)
   AddLogoutButtonTray();
   AddVirtualKeyboardTray();
 #endif
 
-  SystemTrayDelegate* delegate =
-      ash::Shell::GetInstance()->system_tray_delegate();
+  SystemTrayDelegate* delegate = WmShell::Get()->system_tray_delegate();
   DCHECK(delegate);
   // Initialize after all trays have been created.
   system_tray_->InitializeTrayItems(delegate);
   web_notification_tray_->Initialize();
 #if defined(OS_CHROMEOS)
   logout_button_tray_->Initialize();
   virtual_keyboard_tray_->Initialize();
 #endif
   overview_button_tray_->Initialize();
   SetShelfAlignment(system_tray_->shelf_alignment());
@@ skipping 128 matching lines @@
     web_notification_tray_->UpdateAfterLoginStatusChange(login_status);
 #if defined(OS_CHROMEOS)
   if (logout_button_tray_)
     logout_button_tray_->UpdateAfterLoginStatusChange(login_status);
 #endif
   if (overview_button_tray_)
     overview_button_tray_->UpdateAfterLoginStatusChange(login_status);
 }
 
 }  // namespace ash