[mus+ash] Removes WmWindow from ash/shelf and ash/shell

ash/wm/screen_dimmer.cc

 // Copyright (c) 2012 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/wm/screen_dimmer.h"
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shell.h"
 #include "ash/window_user_data.h"
 #include "ash/wm/container_finder.h"
 #include "ash/wm/window_dimmer.h"
-#include "ash/wm_window.h"
 #include "base/memory/ptr_util.h"
 #include "ui/aura/window.h"
 
 namespace ash {
 namespace {
 
 // Opacity when it's dimming the entire screen.
 const float kDimmingLayerOpacityForRoot = 0.4f;
 
 // Opacity for lock screen.
@@ skipping 51 matching lines @@
       else
         container->StackChildAtTop(window_dimmer->window());
       window_dimmer->window()->Show();
     } else if (window_dimmer) {
       window_dimmers_->Set(container, nullptr);
     }
   }
 }
 
 }  // namespace ash