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

ash/wm/maximize_mode/maximize_mode_window_state.h

Index: ash/wm/maximize_mode/maximize_mode_window_state.h
diff --git a/ash/wm/maximize_mode/maximize_mode_window_state.h b/ash/wm/maximize_mode/maximize_mode_window_state.h
index 7cadc5f6a8a0e08dc21ec601701b641e2c858be7..4ab3d5a2712149ba11213ba2c69f1a9c0c6cc658 100644
--- a/ash/wm/maximize_mode/maximize_mode_window_state.h
+++ b/ash/wm/maximize_mode/maximize_mode_window_state.h
@@ -12,7 +12,6 @@
 
 namespace ash {
 class MaximizeModeWindowManager;
-class WmWindow;
 
 // The MaximizeModeWindowState implementation which reduces all possible window
 // states to minimized and maximized. If a window cannot be maximized it will be
@@ -27,7 +26,8 @@ class MaximizeModeWindowState : public wm::WindowState::State {
   // state handler. Upon destruction it will restore the previous state handler
   // and call |creator::WindowStateDestroyed()| to inform that the window mode
   // was reverted to the old window manager.
-  MaximizeModeWindowState(WmWindow* window, MaximizeModeWindowManager* creator);
+  MaximizeModeWindowState(aura::Window* window,
+                          MaximizeModeWindowManager* creator);
   ~MaximizeModeWindowState() override;
 
   void set_ignore_wm_events(bool ignore) { ignore_wm_events_ = ignore; }
@@ -69,8 +69,8 @@ class MaximizeModeWindowState : public wm::WindowState::State {
   // The original state object of the window.
   std::unique_ptr<wm::WindowState::State> old_state_;
 
-  // The state object for this object which owns this instance.
-  WmWindow* window_;
+  // The window whose WindowState owns this instance.
+  aura::Window* window_;
 
   // The creator which needs to be informed when this state goes away.
   MaximizeModeWindowManager* creator_;