GTK: Seal up GSEALs, focusing on GtkSelectionData.

chrome/browser/ui/gtk/certificate_viewer.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 <gtk/gtk.h>
 
 #include <algorithm>
 #include <vector>
 
 #include "base/i18n/time_formatting.h"
@@ skipping 139 matching lines @@
       NULL);
 
   GtkWidget* content_area = gtk_dialog_get_content_area(GTK_DIALOG(dialog_));
   gtk_box_set_spacing(GTK_BOX(content_area), ui::kContentAreaSpacing);
 
   x509_certificate_model::RegisterDynamicOids();
   InitGeneralPage();
   InitDetailsPage();
 
   notebook_ = gtk_notebook_new();
-  gtk_container_add(GTK_CONTAINER(GTK_DIALOG(dialog_)->vbox), notebook_);
+  gtk_container_add(GTK_CONTAINER(content_area), notebook_);
 
   gtk_notebook_append_page(
       GTK_NOTEBOOK(notebook_),
       general_page_vbox_,
       gtk_label_new_with_mnemonic(
           gfx::ConvertAcceleratorsFromWindowsStyle(
               l10n_util::GetStringUTF8(
                   IDS_CERT_INFO_GENERAL_TAB_LABEL)).c_str()));
 
   gtk_notebook_append_page(
@@ skipping 542 matching lines @@
                                  net::X509Certificate::OSCertHandle cert) {
   net::X509Certificate::OSCertHandles cert_chain;
   x509_certificate_model::GetCertChainFromCert(cert, &cert_chain);
   (new CertificateViewer(parent, cert_chain))->Show();
 }
 
 void ShowNativeCertificateViewer(gfx::NativeWindow parent,
                                  net::X509Certificate* cert) {
   ShowNativeCertificateViewer(parent, cert->os_cert_handle());
 }