chromeos: Run beforeunload handlers when closing panels.

chrome/browser/chromeos/notifications/notification_panel.h

 // Copyright (c) 2010 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.
 
 // Draws the view for the balloons.
 
 #ifndef CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_NOTIFICATION_PANEL_H_
 #define CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_NOTIFICATION_PANEL_H_
 #pragma once
 
@@ skipping 79 matching lines @@
 
   // BalloonCollectionImpl::NotificationUI overrides..
   virtual void Add(Balloon* balloon);
   virtual bool Update(Balloon* balloon);
   virtual void Remove(Balloon* balloon);
   virtual void Show(Balloon* balloon);
   virtual void ResizeNotification(Balloon* balloon,
                                   const gfx::Size& size);
   virtual void SetActiveView(BalloonViewImpl* view);
 
-  // PanelController overrides.
+  // PanelController::Delegate overrides.
   virtual string16 GetPanelTitle();
   virtual SkBitmap GetPanelIcon();
+  virtual bool CanClosePanel();
   virtual void ClosePanel();
 
   // NotificationObserver overrides:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   // Called when a mouse left the panel window.
   void OnMouseLeave();
   void OnMouseMotion(const gfx::Point& point);
@@ skipping 124 matching lines @@
   bool IsActive(const BalloonViewImpl* view) const;
 
  private:
   NotificationPanel* panel_;
   DISALLOW_COPY_AND_ASSIGN(NotificationPanelTester);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_NOTIFICATION_PANEL_H_