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

ash/common/system/chromeos/session/tray_session_length_limit_unittest.cc

Index: ash/common/system/chromeos/session/tray_session_length_limit_unittest.cc
diff --git a/ash/system/session/tray_session_length_limit_unittest.cc b/ash/common/system/chromeos/session/tray_session_length_limit_unittest.cc
similarity index 97%
rename from ash/system/session/tray_session_length_limit_unittest.cc
rename to ash/common/system/chromeos/session/tray_session_length_limit_unittest.cc
index 837ae200527a3f848c99b5c3ec6cb6ba85afdf83..ec5f40aeee40aabc50673b82180800bcc0352338 100644
--- a/ash/system/session/tray_session_length_limit_unittest.cc
+++ b/ash/common/system/chromeos/session/tray_session_length_limit_unittest.cc
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/system/session/tray_session_length_limit.h"
+#include "ash/common/system/chromeos/session/tray_session_length_limit.h"
 
+#include "ash/common/system/tray/system_tray.h"
 #include "ash/common/test/test_system_tray_delegate.h"
-#include "ash/system/tray/system_tray.h"
 #include "ash/test/ash_test_base.h"
 #include "base/memory/ptr_util.h"
 #include "base/time/time.h"