[SyncFS] Use nullptr instead of NULL

chrome/browser/sync_file_system/local/canned_syncable_file_system.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 "chrome/browser/sync_file_system/local/canned_syncable_file_system.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/bind.h"
@@ skipping 74 matching lines @@
   run_loop.Run();
 }
 
 void EnsureRunningOn(base::SingleThreadTaskRunner* runner) {
   EXPECT_TRUE(runner->RunsTasksOnCurrentThread());
 }
 
 void VerifySameTaskRunner(
     base::SingleThreadTaskRunner* runner1,
     base::SingleThreadTaskRunner* runner2) {
-  ASSERT_TRUE(runner1 != NULL);
-  ASSERT_TRUE(runner2 != NULL);
+  ASSERT_TRUE(runner1 != nullptr);
+  ASSERT_TRUE(runner2 != nullptr);
   runner1->PostTask(FROM_HERE,
                     base::Bind(&EnsureRunningOn, make_scoped_refptr(runner2)));
 }
 
 void OnCreateSnapshotFileAndVerifyData(
     const std::string& expected_data,
     const CannedSyncableFileSystem::StatusCallback& callback,
     base::File::Error result,
     const base::File::Info& file_info,
     const base::FilePath& platform_path,
@@ skipping 141 matching lines @@
       env_override_);
 
   ScopedVector<storage::FileSystemBackend> additional_backends;
   additional_backends.push_back(SyncFileSystemBackend::CreateForTesting());
 
   file_system_context_ = new FileSystemContext(
       io_task_runner_.get(),
       file_task_runner_.get(),
       storage::ExternalMountPoints::CreateRefCounted().get(),
       storage_policy.get(),
-      quota_manager_.get() ? quota_manager_->proxy() : NULL,
+      quota_manager_.get() ? quota_manager_->proxy() : nullptr,
       additional_backends.Pass(),
       std::vector<storage::URLRequestAutoMountHandler>(),
       data_dir_.path(),
       options);
 
   is_filesystem_set_up_ = true;
 }
 
 void CannedSyncableFileSystem::TearDown() {
-  quota_manager_ = NULL;
-  file_system_context_ = NULL;
+  quota_manager_ = nullptr;
+  file_system_context_ = nullptr;
 
   // Make sure we give some more time to finish tasks on other threads.
   EnsureLastTaskRuns(io_task_runner_.get());
   EnsureLastTaskRuns(file_task_runner_.get());
 }
 
 FileSystemURL CannedSyncableFileSystem::URL(const std::string& path) const {
   EXPECT_TRUE(is_filesystem_set_up_);
   EXPECT_FALSE(root_url_.is_empty());
 
@@ skipping 477 matching lines @@
   sync_status_ = status;
   quit_closure.Run();
 }
 
 void CannedSyncableFileSystem::InitializeSyncStatusObserver() {
   ASSERT_TRUE(io_task_runner_->RunsTasksOnCurrentThread());
   backend()->sync_context()->sync_status()->AddObserver(this);
 }
 
 }  // namespace sync_file_system