Remove base::Value::CreateNullValue

chrome/browser/devtools/devtools_file_helper.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 "chrome/browser/devtools/devtools_file_helper.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/md5.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/value_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/devtools/devtools_file_watcher.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
@@ skipping 352 matching lines @@
   if (!allowed)
     return;
 
   std::string file_system_id = RegisterFileSystem(web_contents_, path);
   std::string file_system_path = path.AsUTF8Unsafe();
 
   DictionaryPrefUpdate update(profile_->GetPrefs(),
                               prefs::kDevToolsFileSystemPaths);
   base::DictionaryValue* file_systems_paths_value = update.Get();
   file_systems_paths_value->SetWithoutPathExpansion(
-      file_system_path, base::Value::CreateNullValue());
+      file_system_path, base::MakeUnique<base::Value>());
 }
 
 std::vector<DevToolsFileHelper::FileSystem>
 DevToolsFileHelper::GetFileSystems() {
   file_system_paths_ = GetAddedFileSystemPaths(profile_);
   std::vector<FileSystem> file_systems;
   for (auto file_system_path : file_system_paths_) {
     base::FilePath path = base::FilePath::FromUTF8Unsafe(file_system_path);
     std::string file_system_id = RegisterFileSystem(web_contents_, path);
     FileSystem filesystem = CreateFileSystemStruct(web_contents_,
@@ skipping 55 matching lines @@
                                  base::Unretained(file_watcher_.get()), path));
   }
 }
 
 void DevToolsFileHelper::FilePathsChanged(
     const std::vector<std::string>& changed_paths,
     const std::vector<std::string>& added_paths,
     const std::vector<std::string>& removed_paths) {
   delegate_->FilePathsChanged(changed_paths, added_paths, removed_paths);
 }