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

ash/system/tray_accessibility.h

 // 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.
 
 #ifndef ASH_SYSTEM_TRAY_ACCESSIBILITY_H_
 #define ASH_SYSTEM_TRAY_ACCESSIBILITY_H_
 
 #include <stdint.h>
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/shell_observer.h"
+#include "ash/common/system/tray/tray_image_item.h"
 #include "ash/system/tray/tray_details_view.h"
-#include "ash/system/tray/tray_image_item.h"
 #include "ash/system/tray/tray_notification_view.h"
 #include "ash/system/tray/view_click_listener.h"
 #include "base/macros.h"
 #include "ui/gfx/font.h"
 #include "ui/views/controls/button/button.h"
 
 namespace chromeos {
 class TrayAccessibilityTest;
 }
 
@@ skipping 119 matching lines @@
   // A11y feature status on just entering the lock screen.
   bool show_a11y_menu_on_lock_screen_;
 
   friend class chromeos::TrayAccessibilityTest;
   DISALLOW_COPY_AND_ASSIGN(TrayAccessibility);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_ACCESSIBILITY_H_