Moves mash/wm into ash/mus

ash/mus/disconnected_app_handler.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "mash/wm/disconnected_app_handler.h"
+#include "ash/mus/disconnected_app_handler.h"
 
-namespace mash {
-namespace wm {
+namespace ash {
+namespace mus {
 
 DisconnectedAppHandler::DisconnectedAppHandler() {}
 
 DisconnectedAppHandler::~DisconnectedAppHandler() {}
 
 void DisconnectedAppHandler::OnWindowEmbeddedAppDisconnected(
-    mus::Window* window) {
+    ::mus::Window* window) {
   window->Destroy();
 }
 
-}  // namespace wm
-}  // namespace mash
+}  // namespace mus
+}  // namespace ash