Move more from WmShell to Shell

ash/common/system/chromeos/session/logout_confirmation_controller.cc

 // Copyright 2014 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/common/system/chromeos/session/logout_confirmation_controller.h"
 
 #include <utility>
 
 #include "ash/common/login_status.h"
 #include "ash/common/system/chromeos/session/logout_confirmation_dialog.h"
@@ skipping 76 matching lines @@
   logout_closure_.Run();
 }
 
 void LogoutConfirmationController::OnDialogClosed() {
   logout_time_ = base::TimeTicks();
   dialog_ = NULL;
   logout_timer_.Stop();
 }
 
 void LogoutConfirmationController::OnLastWindowClosed() {
-  if (WmShell::Get()->system_tray_delegate()->GetUserLoginStatus() !=
+  if (Shell::Get()->system_tray_delegate()->GetUserLoginStatus() !=
       LoginStatus::PUBLIC) {
     return;
   }
 
   // Ask the user to confirm logout if a public session is in progress and the
   // screen is not locked.
   ConfirmLogout(
       base::TimeTicks::Now() +
       base::TimeDelta::FromSeconds(kLogoutConfirmationDelayInSeconds));
 }
 
 }  // namespace ash