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

chrome/browser/ui/gtk/certificate_viewer.cc

Index: chrome/browser/ui/gtk/certificate_viewer.cc
diff --git a/chrome/browser/ui/gtk/certificate_viewer.cc b/chrome/browser/ui/gtk/certificate_viewer.cc
index e062fec3335c085c38f05c66bd9d1cb496646473..3a33274c3ef621faaae4919d788358265fbc0ed4 100644
--- a/chrome/browser/ui/gtk/certificate_viewer.cc
+++ b/chrome/browser/ui/gtk/certificate_viewer.cc
@@ -14,6 +14,7 @@
 #include "base/string_number_conversions.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/certificate_viewer.h"
 #include "chrome/browser/ui/gtk/certificate_dialogs.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
 #include "chrome/common/net/x509_certificate_model.h"
@@ -707,14 +708,14 @@ void CertificateViewer::Show() {
 
 } // namespace
 
-void ShowCertificateViewer(gfx::NativeWindow parent,
-                           net::X509Certificate::OSCertHandle cert) {
+void ShowNativeCertificateViewer(gfx::NativeWindow parent,
+                                 net::X509Certificate::OSCertHandle cert) {
   net::X509Certificate::OSCertHandles cert_chain;
   x509_certificate_model::GetCertChainFromCert(cert, &cert_chain);
   (new CertificateViewer(parent, cert_chain))->Show();
 }
 
-void ShowCertificateViewer(gfx::NativeWindow parent,
-                           net::X509Certificate* cert) {
-  ShowCertificateViewer(parent, cert->os_cert_handle());
+void ShowNativeCertificateViewer(gfx::NativeWindow parent,
+                                 net::X509Certificate* cert) {
+  ShowNativeCertificateViewer(parent, cert->os_cert_handle());
 }