ash: Cleanup class/struct forward declarations

ash/root_window_controller.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_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_ROOT_WINDOW_CONTROLLER_H_
 
 #include <map>
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/shell_observer.h"
 #include "ash/public/cpp/shelf_types.h"
 #include "base/macros.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 
-class SkBitmap;
-
 namespace aura {
-class EventFilter;
 class Window;
 }
 
 namespace gfx {
 class Point;
 }
 
 namespace keyboard {
 class KeyboardController;
 }
 
 namespace ui {
 class EventHandler;
 }
 
 namespace views {
 class Widget;
 }
 
 namespace wm {
-class InputMethodEventFilter;
-class RootWindowEventFilter;
 class ScopedCaptureClient;
 }
 
 namespace ash {
 class AshWindowTreeHost;
 class DockedWindowLayoutManager;
 enum class LoginStatus;
 class PanelLayoutManager;
 class ShelfLayoutManager;
 class StackingController;
 class StatusAreaWidget;
-class SystemModalContainerLayoutManager;
 class SystemTray;
 class SystemWallpaperController;
 class TouchHudDebug;
 class TouchHudProjection;
 class WmRootWindowControllerAura;
 class WmShelfAura;
-class WmWindow;
 class WorkspaceController;
 
 #if defined(OS_CHROMEOS)
 class BootSplashScreen;
 class AshTouchExplorationManager;
 #endif
 
 // This class maintains the per root window state for ash. This class
 // owns the root window and other dependent objects that should be
 // deleted upon the deletion of the root window. This object is
@@ skipping 179 matching lines @@
 
 // On classic ash, returns the RootWindowController for the given |root_window|.
 // On mus ash, returns the RootWindowController for the primary display.
 // See RootWindowController class comment above.
 ASH_EXPORT RootWindowController* GetRootWindowController(
     const aura::Window* root_window);
 
 }  // namespace ash
 
 #endif  // ASH_ROOT_WINDOW_CONTROLLER_H_