Make X509Certificate::GetDEREncoded a static function taking an OSCertHandle

net/base/x509_certificate_nss.cc

Index: net/base/x509_certificate_nss.cc
diff --git a/net/base/x509_certificate_nss.cc b/net/base/x509_certificate_nss.cc
index 4a8a4e0f3c0a59390118695937c7eee6fcf47102..2cfd3f9d9ed7a20969ad088688416278d172254f 100644
--- a/net/base/x509_certificate_nss.cc
+++ b/net/base/x509_certificate_nss.cc
@@ -902,12 +902,13 @@ bool X509Certificate::VerifyEV() const {
   return false;
 }
 
-bool X509Certificate::GetDEREncoded(std::string* encoded) {
-  if (!cert_handle_->derCert.len)
+// static
+bool X509Certificate::GetDEREncoded(X509Certificate::OSCertHandle cert_handle,
+                                    std::string* encoded) {
+  if (!cert_handle->derCert.len)
     return false;
-  encoded->clear();
-  encoded->append(reinterpret_cast<char*>(cert_handle_->derCert.data),
-                  cert_handle_->derCert.len);
+  encoded->assign(reinterpret_cast<char*>(cert_handle->derCert.data),
+                  cert_handle->derCert.len);
   return true;
 }