chromeos: convert more ash/wm code to aura::Window

ash/wm/panels/panel_window_event_handler.cc

 // Copyright 2013 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/panels/panel_window_event_handler.h"
 
 #include "ash/shell_port.h"
 #include "ash/wm/window_state.h"
+#include "ash/wm/window_util.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/hit_test.h"
 #include "ui/events/event.h"
 
 namespace ash {
 
 PanelWindowEventHandler::PanelWindowEventHandler() {}
 
 PanelWindowEventHandler::~PanelWindowEventHandler() {}
 
 void PanelWindowEventHandler::OnMouseEvent(ui::MouseEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
   if (!event->handled() && event->type() == ui::ET_MOUSE_PRESSED &&
       event->flags() & ui::EF_IS_DOUBLE_CLICK &&
       event->IsOnlyLeftMouseButton() &&
-      target->delegate()->GetNonClientComponent(event->location()) ==
-          HTCAPTION) {
+      wm::GetNonClientComponent(target, event->location()) == HTCAPTION) {
     ShellPort::Get()->RecordUserMetricsAction(UMA_PANEL_MINIMIZE_CAPTION_CLICK);
     wm::GetWindowState(target)->Minimize();
     event->StopPropagation();
     return;
   }
 }
 
 void PanelWindowEventHandler::OnGestureEvent(ui::GestureEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
   if (!event->handled() && event->type() == ui::ET_GESTURE_TAP &&
       event->details().tap_count() == 2 &&
-      target->delegate()->GetNonClientComponent(event->location()) ==
-          HTCAPTION) {
+      wm::GetNonClientComponent(target, event->location()) == HTCAPTION) {
     ShellPort::Get()->RecordUserMetricsAction(
         UMA_PANEL_MINIMIZE_CAPTION_GESTURE);
     wm::GetWindowState(target)->Minimize();
     event->StopPropagation();
     return;
   }
 }
 
 }  // namespace ash