Make X509Certificate::GetDEREncoded a static function taking an OSCertHandle

net/base/x509_certificate_mac.cc

Index: net/base/x509_certificate_mac.cc
diff --git a/net/base/x509_certificate_mac.cc b/net/base/x509_certificate_mac.cc
index 0b65c7726ed6c57397fbb661ed6fa56caaa73fd4..fced2234ee1f9ad699c2fc5f2193b4c80056f50c 100644
--- a/net/base/x509_certificate_mac.cc
+++ b/net/base/x509_certificate_mac.cc
@@ -968,15 +968,15 @@ int X509Certificate::VerifyInternal(const std::string& hostname,
   return OK;
 }
 
-bool X509Certificate::GetDEREncoded(std::string* encoded) {
-  encoded->clear();
+// static
+bool X509Certificate::GetDEREncoded(X509Certificate::OSCertHandle cert_handle,
+                                    std::string* encoded) {
   CSSM_DATA der_data;
-  if (SecCertificateGetData(cert_handle_, &der_data) == noErr) {
-    encoded->append(reinterpret_cast<char*>(der_data.Data),
-                    der_data.Length);
-    return true;
-  }
-  return false;
+  if (SecCertificateGetData(cert_handle, &der_data) != noErr)
+    return false;
+  encoded->assign(reinterpret_cast<char*>(der_data.Data),
+                  der_data.Length);
+  return true;
 }
 
 // static