Removes |old| parameter from OnWindowPropertyChanged()

ash/wm/common/panels/panel_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_WM_COMMON_PANELS_PANEL_LAYOUT_MANAGER_H_
 #define ASH_WM_COMMON_PANELS_PANEL_LAYOUT_MANAGER_H_
 
 #include <list>
 #include <memory>
 
@@ skipping 90 matching lines @@
                       const gfx::Rect& requested_bounds) override;
 
   // Overridden from wm::WmOverviewModeObserver
   void OnOverviewModeEnded() override;
 
   // Overridden from wm::WmRootWindowControllerObserver
   void OnShelfAlignmentChanged() override;
 
   // Overridden from wm::WmWindowObserver
   void OnWindowPropertyChanged(wm::WmWindow* window,
-                               wm::WmWindowProperty property,
-                               intptr_t old) override;
+                               wm::WmWindowProperty property) override;
 
   // Overridden from wm::WindowStateObserver
   void OnPostWindowStateTypeChange(wm::WindowState* window_state,
                                    wm::WindowStateType old_type) override;
 
   // Overridden from wm::WmActivationObserver
   void OnWindowActivated(wm::WmWindow* gained_active,
                          wm::WmWindow* lost_active) override;
 
   // Overridden from WindowTreeHostManager::Observer
@@ skipping 82 matching lines @@
   // are currently focused.
   wm::WmWindow* last_active_panel_;
   base::WeakPtrFactory<PanelLayoutManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_COMMON_PANELS_PANEL_LAYOUT_MANAGER_H_