Gut ash::MaterialDesignController, and remove the about:flags entry.

ash/common/wm/overview/window_selector_item.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_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 #define ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/wm/overview/scoped_transform_overview_window.h"
 #include "ash/common/wm_window_observer.h"
 #include "base/macros.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/widget/widget.h"
 
 namespace gfx {
 class SlideAnimation;
 }
 
 namespace views {
 class ImageButton;
 }
 
-namespace wm {
-class Shadow;
-}
-
 namespace ash {
 
 class WindowSelector;
 class WmWindow;
 
 // This class represents an item in overview mode.
 class ASH_EXPORT WindowSelectorItem : public views::ButtonListener,
                                       public WmWindowObserver {
  public:
   // An image button with a close window icon.
@@ skipping 148 matching lines @@
 
   // True when |this| item is visually selected. Item header is made transparent
   // when the item is selected.
   bool selected_;
 
   // A widget that covers the |transform_window_|. The widget has
   // |caption_container_view_| as its contents view. The widget is backed by a
   // NOT_DRAWN layer since most of its surface is transparent.
   std::unique_ptr<views::Widget> item_widget_;
 
-  // Shadow around the item in overview.
-  std::unique_ptr<::wm::Shadow> shadow_;
-
   // Container view that owns a Button view covering the |transform_window_|.
   // That button serves as an event shield to receive all events such as clicks
   // targeting the |transform_window_| or the overview header above the window.
   // The shield button owns |background_view_| which owns |label_view_|
   // and |close_button_|.
   CaptionContainerView* caption_container_view_;
 
   // A View for the text label above the window owned by the |background_view_|.
   views::Label* label_view_;
 
   // A close button for the window in this item owned by the |background_view_|.
   OverviewCloseButton* close_button_;
 
   // Pointer to the WindowSelector that owns the WindowGrid containing |this|.
   // Guaranteed to be non-null for the lifetime of |this|.
   WindowSelector* window_selector_;
 
   // Pointer to a view that covers the original header and has rounded top
   // corners. This view can have its color and opacity animated. It has a layer
   // which is the only textured layer used by the |item_widget_|.
   RoundedContainerView* background_view_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_