[SyncFS] Use nullptr instead of NULL

chrome/browser/sync_file_system/drive_backend/sync_engine_context.cc

 // Copyright 2014 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 "chrome/browser/sync_file_system/drive_backend/sync_engine_context.h"
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 10 matching lines @@
 SyncEngineContext::SyncEngineContext(
     scoped_ptr<drive::DriveServiceInterface> drive_service,
     scoped_ptr<drive::DriveUploaderInterface> drive_uploader,
     TaskLogger* task_logger,
     const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
     const scoped_refptr<base::SequencedTaskRunner>& worker_task_runner)
     : drive_service_(drive_service.Pass()),
       drive_uploader_(drive_uploader.Pass()),
       task_logger_(task_logger ? task_logger->AsWeakPtr()
                                : base::WeakPtr<TaskLogger>()),
-      remote_change_processor_(NULL),
+      remote_change_processor_(nullptr),
       ui_task_runner_(ui_task_runner),
       worker_task_runner_(worker_task_runner) {
   sequence_checker_.DetachFromSequence();
 }
 
 SyncEngineContext::~SyncEngineContext() {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 }
 
 drive::DriveServiceInterface* SyncEngineContext::GetDriveService() {
@@ skipping 49 matching lines @@
   DCHECK(remote_change_processor);
   remote_change_processor_ = remote_change_processor;
 }
 
 void SyncEngineContext::DetachFromSequence() {
   sequence_checker_.DetachFromSequence();
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system