Fix non-noise cpplint errors in //crypto.

crypto/openssl_util.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/openssl_util.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
+#include <string>
+
 #include "base/logging.h"
 #include "base/strings/string_piece.h"
 #include "third_party/boringssl/src/include/openssl/crypto.h"
 #include "third_party/boringssl/src/include/openssl/err.h"
 
 namespace crypto {
 
 namespace {
 
 // Callback routine for OpenSSL to print error messages. |str| is a
@@ skipping 26 matching lines @@
     std::string message;
     location.Write(true, true, &message);
     DVLOG(1) << "OpenSSL ERR_get_error stack from " << message;
     ERR_print_errors_cb(&OpenSSLErrorCallback, NULL);
   } else {
     ERR_clear_error();
   }
 }
 
 }  // namespace crypto