Update from https://crrev.com/312398

crypto/signature_creator_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 "crypto/signature_creator.h"
 
 #include <cryptohi.h>
 #include <keyhi.h>
 #include <stdlib.h>
 
@@ skipping 32 matching lines @@
   if (sign_context_) {
     SGN_DestroyContext(sign_context_, PR_TRUE);
     sign_context_ = NULL;
   }
 }
 
 // static
 SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key,
                                            HashAlgorithm hash_alg) {
   scoped_ptr<SignatureCreator> result(new SignatureCreator);
-  result->key_ = key;
-
   result->sign_context_ = SGN_NewContext(ToNSSSigOid(hash_alg), key->key());
   if (!result->sign_context_) {
     NOTREACHED();
     return NULL;
   }
 
   SECStatus rv = SGN_Begin(result->sign_context_);
   if (rv != SECSuccess) {
     NOTREACHED();
     return NULL;
@@ skipping 41 matching lines @@
   SECStatus rv = SGN_End(sign_context_, &signature_item);
   if (rv != SECSuccess) {
     return false;
   }
   signature->assign(signature_item.data,
                     signature_item.data + signature_item.len);
   SECITEM_FreeItem(&signature_item, PR_FALSE);
   return true;
 }
 
-SignatureCreator::SignatureCreator()
-    : key_(NULL),
-      sign_context_(NULL) {
+SignatureCreator::SignatureCreator() : sign_context_(NULL) {
   EnsureNSSInit();
 }
 
 }  // namespace crypto