Update keygen to use correct NSS slot on ChromeOS multiprofile.

net/base/keygen_handler.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 "net/base/keygen_handler.h"
 
+#if defined(USE_NSS)
+#include "crypto/nss_crypto_module_delegate.h"
+#endif  // defined(USE_NSS)
+
 namespace net {
 
 // The constructor and destructor must be defined in a .cc file so that
 // CryptoModuleBlockingPasswordDelegate can be forward-declared on platforms
 // which use NSS.
 
 KeygenHandler::KeygenHandler(int key_size_in_bits,
                              const std::string& challenge,
                              const GURL& url)
     : key_size_in_bits_(key_size_in_bits),
       challenge_(challenge),
       url_(url),
       stores_key_(true) {
 }
 
 KeygenHandler::~KeygenHandler() {
 }
 
 }  // namespace net