[mus+ash] Removes WmWindow from ash (app_list, frame, metrics, session, system, wallpaper)

ash/wm_window.cc

Index: ash/wm_window.cc
diff --git a/ash/wm_window.cc b/ash/wm_window.cc
index 07feeec53b98b787169a73f2372bbcc986885f2e..aea1e78b6a8e78458ab88749ef2bdc2fcc07881d 100644
--- a/ash/wm_window.cc
+++ b/ash/wm_window.cc
@@ -487,12 +487,6 @@ WmWindow* WmWindow::GetChildByShellWindowId(int id) {
   return Get(window_->GetChildById(id));
 }
 
-void WmWindow::InstallResizeHandleWindowTargeter(
-    ImmersiveFullscreenController* immersive_fullscreen_controller) {
-  window_->SetEventTargeter(base::MakeUnique<ResizeHandleWindowTargeter>(
-      window_, immersive_fullscreen_controller));
-}
-
 void WmWindow::SetBoundsInScreenBehaviorForChildren(
     BoundsInScreenBehavior behavior) {
   window_->SetProperty(