chromeos: Move files in //ash/common to //ash, part 2

ash/wm/screen_dimmer.h

 // 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.
 
-#ifndef ASH_COMMON_WM_SCREEN_DIMMER_H_
-#define ASH_COMMON_WM_SCREEN_DIMMER_H_
+#ifndef ASH_WM_SCREEN_DIMMER_H_
+#define ASH_WM_SCREEN_DIMMER_H_
 
 #include <memory>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/common/shell_observer.h"
 #include "base/macros.h"
 
 namespace ash {
 namespace test {
@@ skipping 53 matching lines @@
   bool at_bottom_;
 
   // Owns the WindowDimmers.
   std::unique_ptr<WmWindowUserData<WindowDimmer>> window_dimmers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenDimmer);
 };
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_WM_SCREEN_DIMMER_H_
+#endif  // ASH_WM_SCREEN_DIMMER_H_