Don't use browser windows for platform app shell windows

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

+// 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.
+
+#include "chrome/browser/ui/gtk/extensions/shell_window_gtk.h"
+
+#include "chrome/browser/extensions/extension_host.h"
+#include "content/browser/renderer_host/render_widget_host_view_gtk.h"
+
+ShellWindowGtk::ShellWindowGtk(ExtensionHost* host)
+    : ShellWindow(host) {
+  host_->view()->SetContainer(this);
+  window_ = GTK_WINDOW(gtk_window_new(GTK_WINDOW_TOPLEVEL));
+
+  gtk_container_add(GTK_CONTAINER(window_), host_->view()->native_view());
+
+  // TOOD(mihaip): Allow window dimensions to be specified in manifest (and
+  // restore prior window dimensions and positions on relaunch).
+  gtk_widget_set_size_request(GTK_WIDGET(window_), 512, 384);
+  gtk_window_set_decorated(window_, false);
+
+  g_signal_connect(window_, "delete-event",
+                   G_CALLBACK(OnMainWindowDeleteEventThunk), this);
+
+  gtk_window_present(window_);
+}
+
+ShellWindowGtk::~ShellWindowGtk() {
+}
+
+void ShellWindowGtk::Close() {
+  gtk_widget_destroy(GTK_WIDGET(window_));
+  delete this;
+}
+
+// Callback for the delete event.  This event is fired when the user tries to
+// close the window (e.g., clicking on the X in the window manager title bar).
+gboolean ShellWindowGtk::OnMainWindowDeleteEvent(GtkWidget* widget,
+                                                 GdkEvent* event) {
+  Close();
+
+  // Return true to prevent the GTK window from being destroyed.  Close will
+  // destroy it for us.
+  return TRUE;
+}
+
+// static
+ShellWindow* ShellWindow::CreateShellWindow(ExtensionHost* host) {
+  return new ShellWindowGtk(host);
+}