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

ash/system/system_clock_observer.cc

Index: ash/system/system_clock_observer.cc
diff --git a/ash/common/system/chromeos/system_clock_observer.cc b/ash/system/system_clock_observer.cc
similarity index 91%
rename from ash/common/system/chromeos/system_clock_observer.cc
rename to ash/system/system_clock_observer.cc
index 984c6ca11aa406935bf27589163994dad492d91e..6caaffa9f964f0f779e01464a79eeb49eb123bd0 100644
--- a/ash/common/system/chromeos/system_clock_observer.cc
+++ b/ash/system/system_clock_observer.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/common/system/chromeos/system_clock_observer.h"
+#include "ash/system/system_clock_observer.h"
 
-#include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/wm_shell.h"
+#include "ash/system/tray/system_tray_notifier.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 
 namespace ash {