replace NULL->nullptr in src/remoting.

remoting/host/token_validator_factory_impl.cc

 // Copyright 2013 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 "remoting/host/token_validator_factory_impl.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/json/json_reader.h"
@@ skipping 64 matching lines @@
 void TokenValidatorImpl::StartValidateRequest(const std::string& token) {
   post_body_ = "code=" + net::EscapeUrlEncodedData(token, true) +
       "&client_id=" + net::EscapeUrlEncodedData(
           key_pair_->GetPublicKey(), true) +
       "&client_secret=" + net::EscapeUrlEncodedData(
           key_pair_->SignMessage(token), true) +
       "&grant_type=authorization_code";
 
   request_ = request_context_getter_->GetURLRequestContext()->CreateRequest(
       third_party_auth_config_.token_validation_url, net::DEFAULT_PRIORITY,
-      this, NULL);
+      this, nullptr);
   request_->SetExtraRequestHeaderByName(
       net::HttpRequestHeaders::kContentType,
       "application/x-www-form-urlencoded", true);
   request_->set_method("POST");
   scoped_ptr<net::UploadElementReader> reader(
       new net::UploadBytesElementReader(
           post_body_.data(), post_body_.size()));
   request_->set_upload(
       net::ElementsUploadDataStream::CreateWithReader(reader.Pass(), 0));
   request_->Start();
@@ skipping 25 matching lines @@
 TokenValidatorFactoryImpl::CreateTokenValidator(
     const std::string& local_jid,
     const std::string& remote_jid) {
   return make_scoped_ptr(
       new TokenValidatorImpl(third_party_auth_config_,
                              key_pair_, local_jid, remote_jid,
                              request_context_getter_));
 }
 
 }  // namespace remoting