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

ash/wallpaper/wallpaper_controller.cc

Index: ash/wallpaper/wallpaper_controller.cc
diff --git a/ash/wallpaper/wallpaper_controller.cc b/ash/wallpaper/wallpaper_controller.cc
index 002449d84d571d28853e5f0d682a09ca1de03767..159890a5a88f809ee2e8786a562a49c682b180c6 100644
--- a/ash/wallpaper/wallpaper_controller.cc
+++ b/ash/wallpaper/wallpaper_controller.cc
@@ -327,7 +327,7 @@ bool WallpaperController::ReparentWallpaper(int container) {
         root_window_controller->wallpaper_widget_controller();
     if (wallpaper_widget_controller) {
       moved |= wallpaper_widget_controller->Reparent(
-          root_window_controller->GetWindow(), container);
+          root_window_controller->GetRootWindow(), container);
     }
     // During wallpaper show animations the controller lives in
     // AnimatingWallpaperWidgetController owned by RootWindowController.
@@ -341,7 +341,7 @@ bool WallpaperController::ReparentWallpaper(int container) {
             : nullptr;
     if (animating_controller) {
       moved |= animating_controller->Reparent(
-          root_window_controller->GetWindow(), container);
+          root_window_controller->GetRootWindow(), container);
     }
   }
   return moved;