Close notification windows while message loop is still active

ash/system/tray/system_tray.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.h"
 
 #include "ash/shell.h"
 #include "ash/shell/panel_window.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/tray/tray_constants.h"
@@ skipping 467 matching lines @@
 }
 
 SystemTray::~SystemTray() {
   for (std::vector<SystemTrayItem*>::iterator it = items_.begin();
       it != items_.end();
       ++it) {
     (*it)->DestroyTrayView();
   }
   if (popup_)
     popup_->CloseNow();
+  ash::Shell::GetInstance()->tray_delegate()->OnTrayDestroyed();
 }
 
 void SystemTray::AddTrayItem(SystemTrayItem* item) {
   items_.push_back(item);
 
   SystemTrayDelegate* delegate = Shell::GetInstance()->tray_delegate();
   views::View* tray_item = item->CreateTrayView(delegate->GetUserLoginStatus());
   if (tray_item) {
     container_->AddChildViewAt(new TrayItemContainer(tray_item), 0);
     PreferredSizeChanged();
@@ skipping 178 matching lines @@
       popup_->Hide();
     }
   }
   return base::EVENT_CONTINUE;
 }
 
 void SystemTray::DidProcessEvent(const base::NativeEvent& event) {
 }
 
 }  // namespace ash