Makes Panel related classes use ash/wm/common types

ash/wm/panels/panel_window_resizer.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_WM_PANELS_PANEL_WINDOW_RESIZER_H_
 #define ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_
 
 #include <memory>
 
 #include "ash/wm/window_resizer.h"
@@ skipping 50 matching lines @@
   void UpdateLauncherPosition();
 
   // Last pointer location in screen coordinates.
   gfx::Point last_location_;
 
   // Wraps a window resizer and adds panel detaching / reattaching and snapping
   // to launcher behavior during drags.
   std::unique_ptr<WindowResizer> next_window_resizer_;
 
   // Panel container window.
-  aura::Window* panel_container_;
-  aura::Window* initial_panel_container_;
+  wm::WmWindow* panel_container_;
+  wm::WmWindow* initial_panel_container_;
 
   // Set to true once Drag() is invoked and the bounds of the window change.
   bool did_move_or_resize_;
 
   // True if the window started attached to the launcher.
   const bool was_attached_;
 
   base::WeakPtrFactory<PanelWindowResizer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelWindowResizer);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_