Don't use browser windows for platform app shell windows

chrome/browser/ui/gtk/extensions/shell_window_gtk.h

+// 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_GTK_EXTENSIONS_SHELL_WINDOW_GTK_H_
+#define CHROME_BROWSER_UI_GTK_EXTENSIONS_SHELL_WINDOW_GTK_H_
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include "chrome/browser/ui/extensions/shell_window.h"
+#include "chrome/browser/ui/gtk/extensions/extension_view_gtk.h"
+#include "ui/base/gtk/gtk_signal.h"
+
+class ExtensionHost;
+
+class ShellWindowGtk : public ShellWindow,
+                       public ExtensionViewGtk::Container {
+ public:
+  explicit ShellWindowGtk(ExtensionHost* host);
+
+  // ShellWindow implementation.
+  virtual void Close() OVERRIDE;
+
+ private:
+  virtual ~ShellWindowGtk();
+
+  CHROMEGTK_CALLBACK_1(ShellWindowGtk, gboolean, OnMainWindowDeleteEvent,
+                       GdkEvent*);
+
+  GtkWindow* window_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShellWindowGtk);
+};
+
+#endif  // CHROME_BROWSER_UI_GTK_EXTENSIONS_SHELL_WINDOW_GTK_H_