ash: Cleanup class/struct forward declarations

ash/common/shell_delegate.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_SHELL_DELEGATE_H_
 #define ASH_COMMON_SHELL_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
 #include "ash/ash_export.h"
 #include "base/callback.h"
 #include "base/strings/string16.h"
 
 class GURL;
 
 namespace app_list {
 class AppListPresenter;
-class AppListViewDelegate;
 }
 
 namespace gfx {
 class Image;
 }
 
 namespace keyboard {
 class KeyboardUI;
 }
 
 namespace service_manager {
 class Connector;
 }
 
 namespace ui {
 class MenuModel;
 }
 
-namespace views {
-class Widget;
-}
-
 namespace ash {
 
 class AccessibilityDelegate;
 class GPUSupport;
 class MediaDelegate;
 class PaletteDelegate;
 class SessionStateDelegate;
 class ShelfDelegate;
 class ShelfModel;
 class SystemTrayDelegate;
@@ skipping 87 matching lines @@
   virtual gfx::Image GetDeprecatedAcceleratorImage() const = 0;
 
   // Toggles the status of the touchpad / touchscreen on or off.
   virtual void ToggleTouchpad() {}
   virtual void ToggleTouchscreen() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELL_DELEGATE_H_