Moves ToastManager from Shell to WmShell

ash/mus/bridge/wm_shell_mus.cc

 // Copyright 2016 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/mus/bridge/wm_shell_mus.h"
 
 #include <utility>
 
 #include "ash/common/display/display_info.h"
 #include "ash/common/keyboard/keyboard_ui.h"
@@ skipping 102 matching lines @@
   // TODO(jamescook): Port ash::sysui::KeyboardUIMus and use it here.
   SetKeyboardUI(KeyboardUI::Create());
 }
 
 WmShellMus::~WmShellMus() {
   // This order mirrors that of Shell.
 
   // Destroy maximize mode controller early on since it has some observers which
   // need to be removed.
   DeleteMaximizeModeController();
+  DeleteToastManager();
   DeleteSystemTrayDelegate();
   // Has to happen before ~MruWindowTracker.
   DeleteWindowCycleController();
   DeleteWindowSelectorController();
   DeleteMruWindowTracker();
   RemoveClientObserver();
   WmShell::Set(nullptr);
 }
 
 // static
@@ skipping 215 matching lines @@
                     OnWindowActivated(gained_active, lost_active));
 }
 
 void WmShellMus::OnDidDestroyClient(::ui::WindowTreeClient* client) {
   DCHECK_EQ(client, client_);
   RemoveClientObserver();
 }
 
 }  // namespace mus
 }  // namespace ash