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

ash/common/system/tray/tray_utils.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_TRAY_UTILS_H_
-#define ASH_SYSTEM_TRAY_TRAY_UTILS_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_
+#define ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_
 
 #include <vector>
 
 #include "ash/common/shelf/shelf_types.h"
 #include "base/strings/string16.h"
 
 namespace views {
 class Label;
 class View;
 }
@@ skipping 14 matching lines @@
 void SetTrayLabelItemBorder(TrayItemView* tray_view, ShelfAlignment alignment);
 
 // Computes an accessible label for this button based on all descendant view
 // labels by concatenating them in depth-first order.
 void GetAccessibleLabelFromDescendantViews(
     views::View* view,
     std::vector<base::string16>& out_labels);
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_TRAY_UTILS_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_