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

ash/wm/overview/scoped_transform_overview_window.cc

Index: ash/wm/overview/scoped_transform_overview_window.cc
diff --git a/ash/wm/overview/scoped_transform_overview_window.cc b/ash/wm/overview/scoped_transform_overview_window.cc
index 518646564804c1852bf9b02b5ab945c58caff86b..933c8b47cf5d89ab46ab3f58fb9366b14245de02 100644
--- a/ash/wm/overview/scoped_transform_overview_window.cc
+++ b/ash/wm/overview/scoped_transform_overview_window.cc
@@ -13,7 +13,6 @@
 #include "ash/wm/window_mirror_view.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
-#include "ash/wm_window.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
@@ -434,9 +433,9 @@ void ScopedTransformOverviewWindow::PrepareForOverview() {
 }
 
 void ScopedTransformOverviewWindow::CloseWidget() {
-  WmWindow* parent_window = WmWindow::Get(GetTransientRoot(window_));
+  aura::Window* parent_window = GetTransientRoot(window_);
   if (parent_window)
-    parent_window->CloseWidget();
+    wm::CloseWidgetForWindow(parent_window);
 }
 
 // static