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

ash/wm/overview/scoped_overview_animation_settings_factory.h

Index: ash/wm/overview/scoped_overview_animation_settings_factory.h
diff --git a/ash/wm/overview/scoped_overview_animation_settings_factory.h b/ash/wm/overview/scoped_overview_animation_settings_factory.h
index cb23ce32d0d04672bf5b3d09b7d650cc151227cf..b22bde2b9ab26015e44c5e9bd8d23d72da7cfed5 100644
--- a/ash/wm/overview/scoped_overview_animation_settings_factory.h
+++ b/ash/wm/overview/scoped_overview_animation_settings_factory.h
@@ -9,10 +9,13 @@
 
 #include "ash/wm/overview/overview_animation_type.h"
 
+namespace aura {
+class Window;
+}
+
 namespace ash {
 
 class ScopedOverviewAnimationSettings;
-class WmWindow;
 
 // Factory for creating ScopedOverviewAnimationSettings.
 class ScopedOverviewAnimationSettingsFactory {
@@ -21,7 +24,7 @@ class ScopedOverviewAnimationSettingsFactory {
 
   virtual std::unique_ptr<ScopedOverviewAnimationSettings>
   CreateOverviewAnimationSettings(OverviewAnimationType animation_type,
-                                  WmWindow* window) = 0;
+                                  aura::Window* window) = 0;
 
  protected:
   ScopedOverviewAnimationSettingsFactory();