[Sync] Replacing NULL with nullptr in code and null in comments for components/sync/

components/sync/engine_impl/net/sync_server_connection_manager.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 "components/sync/engine_impl/net/sync_server_connection_manager.h"
 
 #include <stdint.h>
 
 #include "components/sync/engine/net/http_post_provider_factory.h"
 #include "components/sync/engine/net/http_post_provider_interface.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_status_code.h"
 
 namespace syncer {
 
 SyncBridgedConnection::SyncBridgedConnection(ServerConnectionManager* scm,
                                              HttpPostProviderFactory* factory)
     : Connection(scm), factory_(factory) {
   post_provider_ = factory_->Create();
 }
 
 SyncBridgedConnection::~SyncBridgedConnection() {
   DCHECK(post_provider_);
   factory_->Destroy(post_provider_);
-  post_provider_ = NULL;
+  post_provider_ = nullptr;
 }
 
 bool SyncBridgedConnection::Init(const char* path,
                                  const std::string& auth_token,
                                  const std::string& payload,
                                  HttpResponse* response) {
   std::string sync_server;
   int sync_server_port = 0;
   bool use_ssl = false;
   GetServerParams(&sync_server, &sync_server_port, &use_ssl);
@@ skipping 57 matching lines @@
 }
 
 SyncServerConnectionManager::~SyncServerConnectionManager() {}
 
 ServerConnectionManager::Connection*
 SyncServerConnectionManager::MakeConnection() {
   return new SyncBridgedConnection(this, post_provider_factory_.get());
 }
 
 }  // namespace syncer