Remove ash tray utility functions that are no-ops in MD.

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_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_
 
-#include <vector>
-
-#include "ash/public/cpp/shelf_types.h"
-#include "base/strings/string16.h"
-
 namespace views {
 class Label;
-class View;
 }
 
 namespace ash {
 
-class TrayItemView;
-
 // Sets up a Label properly for the tray (sets color, font etc.).
 void SetupLabelForTray(views::Label* label);
 
-// TODO(jennyz): refactor these two functions to SystemTrayItem.
-// Sets the empty border of an image tray item for adjusting the space
-// around it.
-void SetTrayImageItemBorder(views::View* tray_view, ShelfAlignment alignment);
-// Sets the empty border around a label tray item for adjusting the space
-// around it.
-void SetTrayLabelItemBorder(TrayItemView* tray_view, ShelfAlignment alignment);
-
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_