Revert "chromeos: Move files in //ash/common to //ash, part 3"

ash/common/wm_display_observer.h

Index: ash/common/wm_display_observer.h
diff --git a/ash/wm_display_observer.h b/ash/common/wm_display_observer.h
similarity index 82%
rename from ash/wm_display_observer.h
rename to ash/common/wm_display_observer.h
index a9c1f0c551d10f198153998526468bc89ba4287b..7eef1d2c7ed8c21890abe543295559386eab0d38 100644
--- a/ash/wm_display_observer.h
+++ b/ash/common/wm_display_observer.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_WM_DISPLAY_OBSERVER_H_
-#define ASH_WM_DISPLAY_OBSERVER_H_
+#ifndef ASH_COMMON_WM_DISPLAY_OBSERVER_H_
+#define ASH_COMMON_WM_DISPLAY_OBSERVER_H_
 
 #include "ash/ash_export.h"
 
@@ -24,4 +24,4 @@ class ASH_EXPORT WmDisplayObserver {
 
 }  // namespace ash
 
-#endif  // ASH_WM_DISPLAY_OBSERVER_H_
+#endif  // ASH_COMMON_WM_DISPLAY_OBSERVER_H_