Fix webui cert viewer showing wrong cert chain on NSS and no chain on OpenSSL.

chrome/browser/ui/webui/certificate_viewer_webui.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CERTIFICATE_VIEWER_WEBUI_H_
 #define CHROME_BROWSER_UI_WEBUI_CERTIFICATE_VIEWER_WEBUI_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 115 matching lines @@
   // Helper function to get the certificate index from |args|. Returns -1 if
   // the index is out of range.
   int GetCertificateIndex(const base::ListValue* args) const;
 
   // The certificate being viewed.
   scoped_refptr<net::X509Certificate> cert_;
 
   // The dialog.
   CertificateViewerModalDialog* dialog_;
 
-  // The certificate chain.
+  // The certificate chain. Does not take references, so only valid as long as
+  // |cert_| is.
   net::X509Certificate::OSCertHandles cert_chain_;
 
   DISALLOW_COPY_AND_ASSIGN(CertificateViewerDialogHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CERTIFICATE_VIEWER_WEBUI_H_