Reland r209278

crypto/signature_creator_nss.cc

Index: crypto/signature_creator_nss.cc
diff --git a/crypto/signature_creator_nss.cc b/crypto/signature_creator_nss.cc
index 3a30efba480a3be7f76cd5a2715add5aa85d937e..82e444404c8f1f1bf3d9c7a9ca8b1065937b5dc8 100644
--- a/crypto/signature_creator_nss.cc
+++ b/crypto/signature_creator_nss.cc
@@ -44,11 +44,7 @@ SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key) {
 }
 
 bool SignatureCreator::Update(const uint8* data_part, int data_part_len) {
-  // TODO(wtc): Remove this const_cast when we require NSS 3.12.5.
-  // See NSS bug https://bugzilla.mozilla.org/show_bug.cgi?id=518255
-  SECStatus rv = SGN_Update(sign_context_,
-                            const_cast<unsigned char*>(data_part),
-                            data_part_len);
+  SECStatus rv = SGN_Update(sign_context_, data_part, data_part_len);
   if (rv != SECSuccess) {
     NOTREACHED();
     return false;