mash: Remove last WmWindow uses in ash/shelf.

ash/shelf/shelf_window_watcher.cc

 // Copyright 2013 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 "ash/shelf/shelf_window_watcher.h"
 
 #include <memory>
 #include <utility>
 
 #include "ash/public/cpp/config.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/public/cpp/window_properties.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_model.h"
 #include "ash/shelf/shelf_window_watcher_item_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_port.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
-#include "ash/wm_window.h"
 #include "base/strings/string_number_conversions.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/resources/grit/ui_resources.h"
 #include "ui/wm/public/activation_client.h"
 
 namespace ash {
@@ skipping 264 matching lines @@
   }
 }
 
 void ShelfWindowWatcher::OnDisplayRemoved(const display::Display& old_display) {
 }
 
 void ShelfWindowWatcher::OnDisplayMetricsChanged(const display::Display&,
                                                  uint32_t) {}
 
 }  // namespace ash