Fixing gcc 4.7 building problems.

crypto/third_party/nss/secsign.cc

Index: crypto/third_party/nss/secsign.cc
diff --git a/crypto/third_party/nss/secsign.cc b/crypto/third_party/nss/secsign.cc
index 9272d4a3b5a7b349647ffff723069c2afb724f93..a788defc70410559d0546299802b0a724eaee63f 100644
--- a/crypto/third_party/nss/secsign.cc
+++ b/crypto/third_party/nss/secsign.cc
@@ -93,12 +93,14 @@ SECStatus DerSignData(PLArenaPool *arena,
       hash_type, &hash_data[0], input->data, input->len);
   if (rv != SECSuccess)
     return rv;
-  SECItem hash = {siBuffer, &hash_data[0], hash_data.size()};
+  SECItem hash = {siBuffer, &hash_data[0], 
+		  static_cast<unsigned int>(hash_data.size())};
 
   // Compute signature of hash.
   int signature_len = PK11_SignatureLen(key);
   std::vector<uint8> signature_data(signature_len);
-  SECItem sig = {siBuffer, &signature_data[0], signature_len};
+  SECItem sig = {siBuffer, &signature_data[0], 
+		 static_cast<unsigned int>(signature_len)};
   rv = PK11_Sign(key, &sig, &hash);
   if (rv != SECSuccess)
     return rv;