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

ash/common/system/chromeos/system_clock_observer.h

Index: ash/common/system/chromeos/system_clock_observer.h
diff --git a/ash/system/system_clock_observer.h b/ash/common/system/chromeos/system_clock_observer.h
similarity index 83%
rename from ash/system/system_clock_observer.h
rename to ash/common/system/chromeos/system_clock_observer.h
index 5d8a866d0ab86176a64a8f452aaecc699e22ec99..639f0082b794aac6d99ad1dfe0048e31ce343af7 100644
--- a/ash/system/system_clock_observer.h
+++ b/ash/common/system/chromeos/system_clock_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_SYSTEM_CLOCK_OBSERVER_H_
-#define ASH_SYSTEM_SYSTEM_CLOCK_OBSERVER_H_
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_SYSTEM_CLOCK_OBSERVER_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_SYSTEM_CLOCK_OBSERVER_H_
 
 #include "base/macros.h"
 #include "chromeos/dbus/system_clock_client.h"
@@ -35,4 +35,4 @@ class SystemClockObserver
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_SYSTEM_CLOCK_OBSERVER_H_
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_SYSTEM_CLOCK_OBSERVER_H_