Fixing gcc 4.7 building problems.

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 <pk11pub.h>
@@ skipping 178 matching lines @@
   if ((cert_handle = CERT_StartCertExtensions(cert)) == NULL) {
     LOG(ERROR) << "Unable to get opaque handle for adding extensions";
     CERT_DestroyCertificate(cert);
     return false;
   }
 
   // Create SECItem for IA5String encoding.
   SECItem domain_string_item = {
     siAsciiString,
     (unsigned char*)domain.data(),
-    domain.size()
+    static_cast<unsigned>(domain.size())
   };
 
   // IA5Encode and arena allocate SECItem
   SECItem* asn1_domain_string = SEC_ASN1EncodeItem(
       cert->arena, NULL, &domain_string_item,
       SEC_ASN1_GET(SEC_IA5StringTemplate));
   if (asn1_domain_string == NULL) {
     LOG(ERROR) << "Unable to get ASN1 encoding for domain in domain_bound_cert"
                   " extension";
     CERT_DestroyCertificate(cert);
@@ skipping 73 matching lines @@
                                        domain,
                                        serial_number,
                                        not_valid_before,
                                        not_valid_after,
                                        der_cert);
 }
 
 } // namespace x509_util
 
 } // namespace net