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

net/cert/x509_certificate.cc

Index: net/cert/x509_certificate.cc
diff --git a/net/cert/x509_certificate.cc b/net/cert/x509_certificate.cc
index 052b7b7ecc166a76f8638584a200c657e8656fc6..d46c58448c5c6536664937f93e79008b15cd4b38 100644
--- a/net/cert/x509_certificate.cc
+++ b/net/cert/x509_certificate.cc
@@ -499,6 +499,14 @@ bool X509Certificate::Equals(const X509Certificate* other) const {
   return IsSameOSCert(cert_handle_, other->cert_handle_);
 }
 
+void X509Certificate::GetCertificateChain(OSCertHandles* cert_chain) const {
+  cert_chain->clear();
+  cert_chain->push_back(cert_handle_);
+  cert_chain->insert(cert_chain->end(),
+                     intermediate_ca_certs_.begin(),
+                     intermediate_ca_certs_.end());
+}
+
 // static
 bool X509Certificate::VerifyHostname(
     const std::string& hostname,