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

ash/common/system/chromeos/session/tray_session_length_limit.h

Index: ash/common/system/chromeos/session/tray_session_length_limit.h
diff --git a/ash/system/session/tray_session_length_limit.h b/ash/common/system/chromeos/session/tray_session_length_limit.h
similarity index 85%
rename from ash/system/session/tray_session_length_limit.h
rename to ash/common/system/chromeos/session/tray_session_length_limit.h
index fef3b4f06a043b5a2ae78917889bd357fb382bdc..cc307e1e0ef62a7b4fe0d449ec3f828ffc145265 100644
--- a/ash/system/session/tray_session_length_limit.h
+++ b/ash/common/system/chromeos/session/tray_session_length_limit.h
@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_SESSION_TRAY_SESSION_LENGTH_LIMIT_H_
-#define ASH_SYSTEM_SESSION_TRAY_SESSION_LENGTH_LIMIT_H_
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_SESSION_TRAY_SESSION_LENGTH_LIMIT_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_SESSION_TRAY_SESSION_LENGTH_LIMIT_H_
 
 #include <memory>
 
-#include "ash/system/session/session_length_limit_observer.h"
-#include "ash/system/tray/system_tray_item.h"
+#include "ash/common/system/chromeos/session/session_length_limit_observer.h"
+#include "ash/common/system/tray/system_tray_item.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
@@ -72,4 +72,4 @@ class ASH_EXPORT TraySessionLengthLimit : public SystemTrayItem,
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_SESSION_TRAY_SESSION_LENGTH_LIMIT_H_
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_SESSION_TRAY_SESSION_LENGTH_LIMIT_H_