[mus+ash] Removes WmWindow from ash/wm/mru_window_tracker and overview mode

ash/wm/overview/scoped_overview_animation_settings_factory_aura.h

 // 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.
 
 #ifndef ASH_WM_OVERVIEW_WM_SCOPED_OVERVIEW_ANIMATION_SETTINGS_AURA_H_
 #define ASH_WM_OVERVIEW_WM_SCOPED_OVERVIEW_ANIMATION_SETTINGS_AURA_H_
 
 #include <memory>
 
 #include "ash/wm/overview/scoped_overview_animation_settings_factory.h"
 #include "base/macros.h"
 
 namespace ash {
 
 // Aura implementation of ScopedOverviewAnimationSettingsFactory.
 class ScopedOverviewAnimationSettingsFactoryAura
     : public ScopedOverviewAnimationSettingsFactory {
  public:
   ScopedOverviewAnimationSettingsFactoryAura();
   ~ScopedOverviewAnimationSettingsFactoryAura() override;
 
   // ScopedOverviewAnimationSettingsFactoryAura:
   std::unique_ptr<ScopedOverviewAnimationSettings>
   CreateOverviewAnimationSettings(OverviewAnimationType animation_type,
-                                  WmWindow* window) override;
+                                  aura::Window* window) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScopedOverviewAnimationSettingsFactoryAura);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WM_SCOPED_OVERVIEW_ANIMATION_SETTINGS_AURA_H_