[mus+ash] Removes WmWindow from ash/shelf and ash/shell

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 <vector>
@@ skipping 45 matching lines @@
 class Shelf;
 class ShelfLayoutManager;
 class StackingController;
 class StatusAreaWidget;
 class SystemModalContainerLayoutManager;
 class SystemTray;
 class SystemWallpaperController;
 class TouchHudDebug;
 class TouchHudProjection;
 class WallpaperWidgetController;
+class WmWindow;
 class WorkspaceController;
 
 namespace mus {
 class WindowManager;
 }
 
 namespace wm {
 class RootWindowLayoutManager;
 }
 
@@ skipping 302 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_