chromeos: Run beforeunload handlers when closing panels.

chrome/browser/chromeos/notifications/notification_panel.cc

 // 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.
 
 #include "chrome/browser/chromeos/notifications/notification_panel.h"
 
 #include <algorithm>
 
@@ skipping 592 matching lines @@
 // PanelController overrides.
 
 string16 NotificationPanel::GetPanelTitle() {
   return string16(l10n_util::GetStringUTF16(IDS_NOTIFICATION_PANEL_TITLE));
 }
 
 SkBitmap NotificationPanel::GetPanelIcon() {
   return SkBitmap();
 }
 
+bool NotificationPanel::CanClosePanel() {
+  return true;
+}
+
 void NotificationPanel::ClosePanel() {
   SET_STATE(CLOSED);
   UpdatePanel(false);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NotificationObserver overrides.
 
 void NotificationPanel::Observe(NotificationType type,
                                 const NotificationSource& source,
@@ skipping 241 matching lines @@
                                   &origin);
   return rect.Contains(gfx::Rect(origin, view->bounds().size()));
 }
 
 
 bool NotificationPanelTester::IsActive(const BalloonViewImpl* view) const {
   return panel_->active_ == view;
 }
 
 }  // namespace chromeos