Add --use-more-webui runtime flag to toggle WebUI replacements for native dialogs.

chrome/browser/ui/gtk/certificate_viewer.h

Index: chrome/browser/ui/gtk/certificate_viewer.h
diff --git a/chrome/browser/ui/gtk/certificate_viewer.h b/chrome/browser/ui/gtk/certificate_viewer.h
deleted file mode 100644
index c31477cedc2f6b32bd32573abd99e09df952964f..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/gtk/certificate_viewer.h
+++ /dev/null
@@ -1,16 +0,0 @@
-// 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.
-
-#ifndef CHROME_BROWSER_UI_GTK_CERTIFICATE_VIEWER_H_
-#define CHROME_BROWSER_UI_GTK_CERTIFICATE_VIEWER_H_
-#pragma once
-
-#include "chrome/browser/certificate_viewer.h"
-#include "net/base/x509_certificate.h"
-#include "ui/gfx/native_widget_types.h"
-
-void ShowCertificateViewer(gfx::NativeWindow parent,
-                           net::X509Certificate::OSCertHandle);
-
-#endif  // CHROME_BROWSER_UI_GTK_CERTIFICATE_VIEWER_H_