Use a forward declaration of RSAPrivateKey in crypto/signature_creator.h.

crypto/signature_creator_nss.cc

 // Copyright (c) 2011 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>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "crypto/nss_util.h"
+#include "crypto/rsa_private_key.h"
 
 namespace crypto {
 
 SignatureCreator::~SignatureCreator() {
   if (sign_context_) {
     SGN_DestroyContext(sign_context_, PR_TRUE);
     sign_context_ = NULL;
   }
 }
 
@@ skipping 43 matching lines @@
                     signature_item.data + signature_item.len);
   SECITEM_FreeItem(&signature_item, PR_FALSE);
   return true;
 }
 
 SignatureCreator::SignatureCreator() : sign_context_(NULL) {
   EnsureNSSInit();
 }
 
 }  // namespace crypto