chromeos: Eliminate WmWindow from //ash/system

ash/system/palette/palette_utils.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 "ash/system/palette/palette_utils.h"
 
 #include "ash/ash_switches.h"
 #include "ash/palette_delegate.h"
 #include "ash/shelf/wm_shelf.h"
 #include "ash/shell.h"
 #include "ash/system/palette/palette_tray.h"
 #include "ash/system/status_area_widget.h"
-#include "ash/wm_window.h"
 #include "base/command_line.h"
 #include "ui/display/display.h"
 #include "ui/events/devices/input_device_manager.h"
 #include "ui/events/devices/touchscreen_device.h"
 #include "ui/gfx/geometry/point.h"
 
 namespace ash {
 namespace palette_utils {
 
 bool HasStylusInput() {
@@ skipping 35 matching lines @@
         WmShelf::ForWindow(window)->GetStatusAreaWidget()->palette_tray();
     if (palette_tray && palette_tray->ContainsPointInScreen(point))
       return true;
   }
 
   return false;
 }
 
 }  // namespace palette_utils
 }  // namespace ash