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

ash/focus_cycler.cc

Index: ash/focus_cycler.cc
diff --git a/ash/focus_cycler.cc b/ash/focus_cycler.cc
index 4927bfecfdf99e61640454505c4d3c64751365d4..24126d814b120a5aaf7a13b4f6a09a149b81f52a 100644
--- a/ash/focus_cycler.cc
+++ b/ash/focus_cycler.cc
@@ -9,7 +9,6 @@
 #include "ash/wm/widget_finder.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
-#include "ash/wm_window.h"
 #include "ui/views/accessible_pane_view.h"
 #include "ui/views/focus/focus_search.h"
 #include "ui/views/widget/widget.h"
@@ -40,9 +39,9 @@ void FocusCycler::RemoveWidget(views::Widget* widget) {
 }
 
 void FocusCycler::RotateFocus(Direction direction) {
-  WmWindow* window = WmWindow::Get(wm::GetActiveWindow());
+  aura::Window* window = wm::GetActiveWindow();
   if (window) {
-    views::Widget* widget = GetInternalWidgetForWindow(window->aura_window());
+    views::Widget* widget = GetInternalWidgetForWindow(window);
     // First try to rotate focus within the active widget. If that succeeds,
     // we're done.
     if (widget &&
@@ -85,9 +84,9 @@ void FocusCycler::RotateFocus(Direction direction) {
           Shell::Get()->mru_window_tracker()->BuildMruWindowList());
       if (mru_windows.empty())
         break;
-      WmWindow* window = mru_windows.front();
-      window->GetWindowState()->Activate();
-      views::Widget* widget = GetInternalWidgetForWindow(window->aura_window());
+      auto* window = mru_windows.front();
+      wm::GetWindowState(window)->Activate();
+      views::Widget* widget = GetInternalWidgetForWindow(window);
       if (!widget)
         break;
       views::FocusManager* focus_manager = widget->GetFocusManager();