Remove BrowserList::GetLastActive usage from WebUI pages.

chrome/browser/ui/gtk/certificate_viewer_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 <gtk/gtk.h>
 #include <pango/pango-font.h>
 
 #include <algorithm>
 #include <vector>
 
@@ skipping 702 matching lines @@
   ShowCertExportDialog(NULL, GTK_WINDOW(viewer->dialog_),
                        viewer->cert_chain_list_[cert_index]);
 }
 
 void CertificateViewer::Show() {
   gtk_util::ShowDialog(dialog_);
 }
 
 } // namespace
 
-void ShowCertificateViewer(gfx::NativeWindow parent,
+void ShowCertificateViewer(content::WebContents* web_contents,
+                           gfx::NativeWindow parent,
                            net::X509Certificate* cert) {
   (new CertificateViewer(parent, cert))->Show();
 }