Revert "chromeos: Move files in //ash/common to //ash, part 1"

ash/common/system/chromeos/supervised/custodian_info_tray_observer.h

Index: ash/common/system/chromeos/supervised/custodian_info_tray_observer.h
diff --git a/ash/system/supervised/custodian_info_tray_observer.h b/ash/common/system/chromeos/supervised/custodian_info_tray_observer.h
similarity index 67%
rename from ash/system/supervised/custodian_info_tray_observer.h
rename to ash/common/system/chromeos/supervised/custodian_info_tray_observer.h
index fa27f151455ddd4eaab599f43aa97648dbc8af08..4df0a9a5044b4e137c249f2c52ef77ab01bc883f 100644
--- a/ash/system/supervised/custodian_info_tray_observer.h
+++ b/ash/common/system/chromeos/supervised/custodian_info_tray_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_SYSTEM_SUPERVISED_CUSTODIAN_INFO_TRAY_OBSERVER_H_
-#define ASH_SYSTEM_SUPERVISED_CUSTODIAN_INFO_TRAY_OBSERVER_H_
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_SUPERVISED_CUSTODIAN_INFO_TRAY_OBSERVER_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_SUPERVISED_CUSTODIAN_INFO_TRAY_OBSERVER_H_
 
 namespace ash {
 
@@ -20,4 +20,4 @@ class CustodianInfoTrayObserver {
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_SUPERVISED_CUSTODIAN_INFO_TRAY_OBSERVER_H_
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_SUPERVISED_CUSTODIAN_INFO_TRAY_OBSERVER_H_