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

ash/system/chromeos/brightness/tray_brightness.h

 // Copyright 2013 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.
 
 #ifndef ASH_SYSTEM_CHROMEOS_BRIGHTNESS_TRAY_BRIGHTNESS_H_
 #define ASH_SYSTEM_CHROMEOS_BRIGHTNESS_TRAY_BRIGHTNESS_H_
 
-#include "ash/system/tray/system_tray_item.h"
-#include "base/compiler_specific.h"
+#include "ash/common/system/tray/system_tray_item.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chromeos/dbus/power_manager_client.h"
 
 namespace ash {
 namespace tray {
 class BrightnessView;
 }
 
 class ASH_EXPORT TrayBrightness
@@ skipping 41 matching lines @@
   bool got_current_percent_;
 
   base::WeakPtrFactory<TrayBrightness> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBrightness);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_BRIGHTNESS_TRAY_BRIGHTNESS_H_