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diff --git a/chrome/browser/ui/panels/native_panel_cocoa.h b/chrome/browser/ui/panels/native_panel_cocoa.h
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+++ b/chrome/browser/ui/panels/native_panel_cocoa.h
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+// Copyright (c) 2012 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_NATIVE_PANEL_COCOA_H_
+#define CHROME_BROWSER_UI_PANELS_NATIVE_PANEL_COCOA_H_
+#pragma once
+
+#include "chrome/browser/ui/panels/native_panel.h"
+
+// Cocoa NativePanel interface used by the PanelWindowControllerCocoa class
+// as its C++ window shim. I wish I had a "friend @class" construct to make
+// this interface non-public.
+class NativePanelCocoa : public NativePanel {
+ public:
+  virtual ~NativePanelCocoa() {}
+
+  virtual Panel* panel() const = 0;
+
+  // Callback from cocoa panel window controller that native window was actually
+  // closed. The window may not close right away because of onbeforeunload
+  // handlers.
+  virtual void DidCloseNativeWindow() = 0;
+};
+
+#endif  // CHROME_BROWSER_UI_PANELS_NATIVE_PANEL_H_