Delete some unused code found by -Wunused-function

net/base/x509_util_nss.cc

 // 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.
 
 #include "net/base/x509_util.h"
 #include "net/base/x509_util_nss.h"
 
 #include <cert.h>
 #include <cryptohi.h>
 #include <nss.h>
@@ skipping 236 matching lines @@
 
   DCHECK(cert->derCert.len);
   // XXX copied from X509Certificate::GetDEREncoded
   der_cert->clear();
   der_cert->append(reinterpret_cast<char*>(cert->derCert.data),
                    cert->derCert.len);
   CERT_DestroyCertificate(cert);
   return true;
 }
 
+#if defined(USE_NSS) || defined(OS_IOS)
 // Callback for CERT_DecodeCertPackage(), used in
 // CreateOSCertHandlesFromBytes().
 SECStatus PR_CALLBACK CollectCertsCallback(void* arg,
                                            SECItem** certs,
                                            int num_certs) {
   X509Certificate::OSCertHandles* results =
       reinterpret_cast<X509Certificate::OSCertHandles*>(arg);
 
   for (int i = 0; i < num_certs; ++i) {
     X509Certificate::OSCertHandle handle =
         X509Certificate::CreateOSCertHandleFromBytes(
             reinterpret_cast<char*>(certs[i]->data), certs[i]->len);
     if (handle)
       results->push_back(handle);
   }
 
   return SECSuccess;
 }
+#endif  // defined(USE_NSS) || defined(OS_IOS)
 
 }  // namespace
 
 namespace x509_util {
 
 CERTCertificate* CreateSelfSignedCert(
     SECKEYPublicKey* public_key,
     SECKEYPrivateKey* private_key,
     const std::string& subject,
     uint32 serial_number,
@@ skipping 238 matching lines @@
       *type = X509Certificate::kPublicKeyTypeUnknown;
       *size_bits = 0;
       break;
   }
 }
 #endif  // defined(USE_NSS) || defined(OS_IOS)
 
 } // namespace x509_util
 
 } // namespace net