Reland: Implement correct Panel closing sequence for Mac.

chrome/browser/ui/panels/panel_browser_window_cocoa.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_UI_PANELS_PANEL_BROWSER_WINDOW_COCOA_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_COCOA_H_
 
 #import <Foundation/Foundation.h>
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 38 matching lines @@
       const NativeWebKeyboardEvent& event,
       bool* is_keyboard_shortcut) OVERRIDE;
   virtual void HandlePanelKeyboardEvent(
       const NativeWebKeyboardEvent& event) OVERRIDE;
   virtual Browser* GetPanelBrowser() const OVERRIDE;
   virtual void DestroyPanelBrowser() OVERRIDE;
 
   Panel* panel() { return panel_.get(); }
   Browser* browser() const { return browser_.get(); }
 
+  // Callback from PanelWindowControllerCocoa that native window was actually
+  // closed. The window may not close right away because of onbeforeunload
+  // handlers.
+  void didCloseNativeWindow();
+
  private:
   friend class PanelBrowserWindowCocoaTest;
   FRIEND_TEST_ALL_PREFIXES(PanelBrowserWindowCocoaTest, CreateClose);
   FRIEND_TEST_ALL_PREFIXES(PanelBrowserWindowCocoaTest, NativeBounds);
   FRIEND_TEST_ALL_PREFIXES(PanelBrowserWindowCocoaTest, TitlebarViewCreate);
   FRIEND_TEST_ALL_PREFIXES(PanelBrowserWindowCocoaTest, TitlebarViewSizing);
   FRIEND_TEST_ALL_PREFIXES(PanelBrowserWindowCocoaTest, TitlebarViewClose);
   FRIEND_TEST_ALL_PREFIXES(PanelBrowserWindowCocoaTest, MenuItems);
 
   bool isClosed();
 
   scoped_ptr<Browser> browser_;
   scoped_ptr<Panel> panel_;
   gfx::Rect bounds_;
   PanelWindowControllerCocoa* controller_;  // Weak, owns us.
   bool is_shown_;  // Panel is hidden on creation, Show() changes that forever.
   bool has_find_bar_; // Find bar should only be created once per panel.
 
   DISALLOW_COPY_AND_ASSIGN(PanelBrowserWindowCocoa);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_COCOA_H_