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

ash/common/wm_transient_window_observer.h

Index: ash/common/wm_transient_window_observer.h
diff --git a/ash/wm_transient_window_observer.h b/ash/common/wm_transient_window_observer.h
similarity index 77%
rename from ash/wm_transient_window_observer.h
rename to ash/common/wm_transient_window_observer.h
index 0916f4efb5e3ac78a5ed077749a6afb41882ad88..c49ed2762488e604c26a1513fe0d7ed2ab7271d7 100644
--- a/ash/wm_transient_window_observer.h
+++ b/ash/common/wm_transient_window_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_TRANSIENT_WINDOW_OBSERVER_H_
-#define ASH_WM_TRANSIENT_WINDOW_OBSERVER_H_
+#ifndef ASH_COMMON_WM_TRANSIENT_WINDOW_OBSERVER_H_
+#define ASH_COMMON_WM_TRANSIENT_WINDOW_OBSERVER_H_
 
 #include "ash/ash_export.h"
 
@@ -22,4 +22,4 @@ class ASH_EXPORT WmTransientWindowObserver {
 
 }  // namespace ash
 
-#endif  // ASH_WM_TRANSIENT_WINDOW_OBSERVER_H_
+#endif  // ASH_COMMON_WM_TRANSIENT_WINDOW_OBSERVER_H_