GTK: More raw struct access removal, this time focusing on GtkDialog.

chrome/browser/ui/gtk/edit_search_engine_dialog.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/ui/gtk/edit_search_engine_dialog.h"
 
 #include <gtk/gtk.h>
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/rtl.h"
@@ skipping 161 matching lines @@
 
   GtkWidget* controls = gtk_util::CreateLabeledControlsGroup(NULL,
       l10n_util::GetStringUTF8(
           IDS_SEARCH_ENGINES_EDITOR_DESCRIPTION_LABEL).c_str(),
       gtk_util::CreateEntryImageHBox(title_entry_, title_image_),
       l10n_util::GetStringUTF8(IDS_SEARCH_ENGINES_EDITOR_KEYWORD_LABEL).c_str(),
       gtk_util::CreateEntryImageHBox(keyword_entry_, keyword_image_),
       l10n_util::GetStringUTF8(IDS_SEARCH_ENGINES_EDITOR_URL_LABEL).c_str(),
       gtk_util::CreateEntryImageHBox(url_entry_, url_image_),
       NULL);
-  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog_)->vbox), controls,
-                     FALSE, FALSE, 0);
+
+  GtkWidget* content_area = gtk_dialog_get_content_area(GTK_DIALOG(dialog_));
+  gtk_box_pack_start(GTK_BOX(content_area), controls, FALSE, FALSE, 0);
 
   // On RTL UIs (such as Arabic and Hebrew) the description text is not
   // displayed correctly since it contains the substring "%s". This substring
   // is not interpreted by the Unicode BiDi algorithm as an LTR string and
   // therefore the end result is that the following right to left text is
   // displayed: ".three two s% one" (where 'one', 'two', etc. are words in
   // Hebrew).
   //
   // In order to fix this problem we transform the substring "%s" so that it
   // is displayed correctly when rendered in an RTL context.
   std::string description =
       l10n_util::GetStringUTF8(IDS_SEARCH_ENGINES_EDITOR_URL_DESCRIPTION_LABEL);
   if (base::i18n::IsRTL()) {
     const std::string reversed_percent("s%");
     std::string::size_type percent_index = description.find("%s");
     if (percent_index != std::string::npos) {
       description.replace(percent_index,
                           reversed_percent.length(),
                           reversed_percent);
     }
   }
 
   GtkWidget* description_label = gtk_label_new(description.c_str());
-  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog_)->vbox), description_label,
+  gtk_box_pack_start(GTK_BOX(content_area), description_label,
                      FALSE, FALSE, 0);
 
-  gtk_box_set_spacing(GTK_BOX(GTK_DIALOG(dialog_)->vbox),
-                      ui::kContentAreaSpacing);
+  gtk_box_set_spacing(GTK_BOX(content_area), ui::kContentAreaSpacing);
 
   EnableControls();
 
   gtk_util::ShowDialog(dialog_);
 
   g_signal_connect(dialog_, "response", G_CALLBACK(OnResponseThunk), this);
   g_signal_connect(dialog_, "destroy", G_CALLBACK(OnWindowDestroyThunk), this);
 }
 
 string16 EditSearchEngineDialog::GetTitleInput() const {
@@ skipping 49 matching lines @@
                                  GetURLInput());
   } else {
     controller_->CleanUpCancelledAdd();
   }
   gtk_widget_destroy(dialog_);
 }
 
 void EditSearchEngineDialog::OnWindowDestroy(GtkWidget* widget) {
   MessageLoop::current()->DeleteSoon(FROM_HERE, this);
 }