Make X509Certificate::GetDEREncoded a static function taking an OSCertHandle

net/base/x509_certificate_mac.cc

 // Copyright (c) 2011 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.
 
 #include "net/base/x509_certificate.h"
 
 #include <CommonCrypto/CommonDigest.h>
 #include <CoreServices/CoreServices.h>
 #include <Security/Security.h>
 #include <time.h>
@@ skipping 939 matching lines @@
       }
     }
   }
 
   AppendPublicKeyHashes(completed_chain, &verify_result->public_key_hashes);
   verify_result->is_issued_by_known_root = IsIssuedByKnownRoot(completed_chain);
 
   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
 bool X509Certificate::IsSameOSCert(X509Certificate::OSCertHandle a,
                                    X509Certificate::OSCertHandle b) {
   DCHECK(a && b);
   if (a == b)
     return true;
   if (CFEqual(a, b))
     return true;
@@ skipping 389 matching lines @@
   CSSM_DATA cert_data;
   OSStatus status = SecCertificateGetData(cert_handle, &cert_data);
   if (status)
     return false;
 
   return pickle->WriteData(reinterpret_cast<char*>(cert_data.Data),
                            cert_data.Length);
 }
 
 }  // namespace net