Removes |old| parameter from OnWindowPropertyChanged()

ash/wm/common/always_on_top_controller.cc

 // 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.
 
 #include "ash/wm/common/always_on_top_controller.h"
 
 #include "ash/wm/common/wm_shell_window_ids.h"
 #include "ash/wm/common/wm_window.h"
 #include "ash/wm/common/wm_window_property.h"
 #include "ash/wm/common/workspace/workspace_layout_manager.h"
@@ skipping 39 matching lines @@
     wm::WmWindow* window,
     const TreeChangeParams& params) {
   if (params.old_parent == always_on_top_container_)
     params.target->RemoveObserver(this);
   else if (params.new_parent == always_on_top_container_)
     params.target->AddObserver(this);
 }
 
 void AlwaysOnTopController::OnWindowPropertyChanged(
     wm::WmWindow* window,
-    wm::WmWindowProperty property,
-    intptr_t old) {
+    wm::WmWindowProperty property) {
   if (window != always_on_top_container_ &&
       property == wm::WmWindowProperty::ALWAYS_ON_TOP) {
     DCHECK(window->GetType() == ui::wm::WINDOW_TYPE_NORMAL ||
            window->GetType() == ui::wm::WINDOW_TYPE_POPUP);
     wm::WmWindow* container = GetContainer(window);
     if (window->GetParent() != container)
       container->AddChild(window);
   }
 }
 
 void AlwaysOnTopController::OnWindowDestroying(wm::WmWindow* window) {
   if (window == always_on_top_container_) {
     always_on_top_container_->RemoveObserver(this);
     always_on_top_container_ = nullptr;
   }
 }
 
 }  // namespace ash