Decouples certificates viewers from NSS to prepare support for OpenSSL.

chrome/browser/gtk/certificate_viewer.h

Index: chrome/browser/gtk/certificate_viewer.h
diff --git a/chrome/browser/gtk/certificate_viewer.h b/chrome/browser/gtk/certificate_viewer.h
index fdc905dee118b14f4bed9fa24767b32a50f3730b..16ad370bd270d29f52ba1fb749a114720d515a26 100644
--- a/chrome/browser/gtk/certificate_viewer.h
+++ b/chrome/browser/gtk/certificate_viewer.h
@@ -8,9 +8,9 @@
 
 #include "chrome/browser/certificate_viewer.h"
 #include "gfx/native_widget_types.h"
+#include "net/base/x509_certificate.h"
 
-typedef struct CERTCertificateStr CERTCertificate;
-
-void ShowCertificateViewer(gfx::NativeWindow parent, CERTCertificate* cert);
+void ShowCertificateViewer(gfx::NativeWindow parent,
+                           net::X509Certificate::OSCertHandle);
 
 #endif  // CHROME_BROWSER_GTK_CERTIFICATE_VIEWER_H_