ash: Cleanup class/struct forward declarations

ash/common/system/tray/tray_popup_utils.h

 // Copyright 2016 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_POPUP_UTILS_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_UTILS_H_
 
 #include "ash/common/login_status.h"
 #include "ash/common/system/tray/tray_popup_ink_drop_style.h"
 #include "ash/common/system/tray/tri_view.h"
 #include "base/strings/string16.h"
 
 namespace views {
-class Border;
 class ButtonListener;
 class ImageView;
 class InkDrop;
 class InkDropRipple;
 class InkDropHighlight;
 class InkDropHostView;
 class InkDropMask;
 class Label;
 class LabelButton;
-class LayoutManager;
 class Separator;
 class Slider;
 class SliderListener;
 class ToggleButton;
 }  // namespace views
 
 namespace ash {
 
 // Factory/utility functions used by the system menu.
 class TrayPopupUtils {
@@ skipping 147 matching lines @@
   // |ink_drop_style|.
   static gfx::Rect GetInkDropBounds(TrayPopupInkDropStyle ink_drop_style,
                                     const views::View* host);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(TrayPopupUtils);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_UTILS_H_