chromeos: Run beforeunload handlers when closing panels.

chrome/browser/chromeos/frame/panel_browser_view.h

 // Copyright (c) 2011 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 CHROME_BROWSER_CHROMEOS_FRAME_PANEL_BROWSER_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_FRAME_PANEL_BROWSER_VIEW_H_
 #pragma once
 
 #include "app/x11_util.h"
 #include "base/scoped_ptr.h"
@@ skipping 19 matching lines @@
   virtual void SetBounds(const gfx::Rect& bounds);
   virtual void Close();
   virtual void UpdateTitleBar();
   virtual void ActivationChanged(bool activated);
   virtual void SetCreatorView(PanelBrowserView* creator);
   virtual bool GetSavedWindowBounds(gfx::Rect* bounds) const;
 
   // PanelController::Delegate overrides
   virtual string16 GetPanelTitle();
   virtual SkBitmap GetPanelIcon();
+  virtual bool CanClosePanel();
   virtual void ClosePanel();
   virtual void OnPanelStateChanged(PanelController::State state) {}
 
  private:
   // Enforces the min, max, and default bounds.
   void LimitBounds(gfx::Rect* bounds) const;
 
   // Controls interactions with the window manager for popup panels.
   scoped_ptr<chromeos::PanelController> panel_controller_;
 
   // X id for the content window of the panel that created this
   // panel.  This tells ChromeOS that it should be created next to the
   // content window of this panel.
   XID creator_xid_;
   DISALLOW_COPY_AND_ASSIGN(PanelBrowserView);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FRAME_PANEL_BROWSER_VIEW_H_