gtk: Use gtk_dialog_get_content_area() throughout.

chrome/browser/chromeos/native_dialog_window.cc

 // 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.
 
 #include "chrome/browser/chromeos/native_dialog_window.h"
 
 #include <gtk/gtk.h>
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
@@ skipping 207 matching lines @@
   // Get focus widget of the dialog.
   GtkWidget* focus_widget = gtk_window_get_focus(GTK_WINDOW(dialog_));
 
   // Create a GtkAlignment as dialog contents container.
   GtkWidget* contents = gtk_alignment_new(0.5, 0.5, 1.0, 1.0);
   gtk_alignment_set_padding(GTK_ALIGNMENT(contents),
       kDialogPadding, kDialogPadding,
       kDialogPadding, kDialogPadding);
 
   // Move dialog contents into our container.
-  GtkWidget* dialog_contents = GTK_DIALOG(dialog_)->vbox;
-  g_object_ref(dialog_contents);
-  gtk_container_remove(GTK_CONTAINER(dialog_), dialog_contents);
-  gtk_container_add(GTK_CONTAINER(contents), dialog_contents);
-  g_object_unref(dialog_contents);
+  GtkWidget* content_area = gtk_dialog_get_content_area(GTK_DIALOG(dialog_));
+  g_object_ref(content_area);
+  gtk_container_remove(GTK_CONTAINER(dialog_), content_area);
+  gtk_container_add(GTK_CONTAINER(contents), content_area);
+  g_object_unref(content_area);
   gtk_widget_hide(dialog_);
 
   g_object_set_data(G_OBJECT(dialog_), kNativeDialogHost,
       reinterpret_cast<gpointer>(this));
 
   gtk_widget_show_all(contents);
 
   contents_view_ = new views::NativeViewHost();
   // TODO(xiyuan): Find a better way to get proper background.
   contents_view_->set_background(views::Background::CreateSolidBackground(
@@ skipping 96 matching lines @@
   return host ? host->GetWidget()->GetNativeWindow() : NULL;
 }
 
 gfx::Rect GetNativeDialogContentsBounds(gfx::NativeView native_dialog) {
   NativeDialogHost* host = reinterpret_cast<NativeDialogHost*>(
       g_object_get_data(G_OBJECT(native_dialog), kNativeDialogHost));
   return host ? host->bounds() : gfx::Rect();
 }
 
 }  // namespace chromeos