Converts remaining usage of WmLayoutManager to aura::LayoutManager

ash/system/status_area_layout_manager.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_SYSTEM_STATUS_AREA_LAYOUT_MANAGER_H_
 #define ASH_SYSTEM_STATUS_AREA_LAYOUT_MANAGER_H_
 
 #include "ash/wm/wm_snap_to_pixel_layout_manager.h"
 #include "base/macros.h"
 
 namespace ash {
 
 class ShelfWidget;
 
 // StatusAreaLayoutManager is a layout manager responsible for the status area.
 // In any case when status area needs relayout it redirects this call to
 // ShelfLayoutManager.
 class StatusAreaLayoutManager : public wm::WmSnapToPixelLayoutManager {
  public:
   explicit StatusAreaLayoutManager(ShelfWidget* shelf_widget);
   ~StatusAreaLayoutManager() override;
 
   // Overridden from wm::WmSnapToPixelLayoutManager:
   void OnWindowResized() override;
-  void SetChildBounds(WmWindow* child,
+  void SetChildBounds(aura::Window* child,
                       const gfx::Rect& requested_bounds) override;
 
  private:
   // Updates layout of the status area. Effectively calls ShelfLayoutManager
   // to update layout of the shelf.
   void LayoutStatusArea();
 
   // True when inside LayoutStatusArea method.
   // Used to prevent calling itself again from SetChildBounds().
   bool in_layout_;
 
   ShelfWidget* shelf_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_STATUS_AREA_LAYOUT_MANAGER_H_