Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/profile_resetter/automatic_profile_resetter_mementos.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/profile_resetter/automatic_profile_resetter_mementos.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 102 matching lines @@
     const base::FilePath& memento_file_path) {
   std::string value;
   base::ReadFileToString(memento_file_path, &value);
   return value;
 }
 
 void FileHostedPromptMemento::StoreValueOnFileThread(
     const base::FilePath& memento_file_path,
     const std::string& value) {
   int retval =
-      file_util::WriteFile(memento_file_path, value.c_str(), value.size());
+      base::WriteFile(memento_file_path, value.c_str(), value.size());
   DCHECK_EQ(retval, (int)value.size());
 }
 
 base::FilePath FileHostedPromptMemento::GetMementoFilePath() const {
   return profile_->GetPath().Append(chrome::kResetPromptMementoFilename);
 }