mash: Move SystemTrayImage and TrayImageItem to //ash/common

ash/system/date/tray_date.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/system/date/tray_date.h"
 
 #include "ash/common/shelf/wm_shelf_util.h"
+#include "ash/common/system/tray/tray_item_view.h"
 #include "ash/shelf/shelf_util.h"
 #include "ash/shell.h"
 #include "ash/system/date/date_default_view.h"
 #include "ash/system/date/date_view.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_notifier.h"
-#include "ash/system/tray/tray_item_view.h"
 
 #if defined(OS_CHROMEOS)
 #include "ash/system/chromeos/system_clock_observer.h"
 #endif
 
 namespace ash {
 
 TrayDate::TrayDate(SystemTray* system_tray)
     : SystemTrayItem(system_tray),
       time_tray_(NULL),
@@ skipping 98 matching lines @@
         can_set_time ? TrayDate::SET_SYSTEM_TIME : TrayDate::NONE);
   }
 }
 
 void TrayDate::Refresh() {
   if (time_tray_)
     time_tray_->UpdateText();
 }
 
 }  // namespace ash