Move directory creation functions to base namespace.

chrome/installer/util/lzma_util.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/installer/util/lzma_util.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 
@@ skipping 224 matching lines @@
 void LzmaUtil::CloseArchive() {
   if (archive_handle_) {
     CloseHandle(archive_handle_);
     archive_handle_ = NULL;
   }
 }
 
 bool LzmaUtil::CreateDirectory(const base::FilePath& dir) {
   bool ret = true;
   if (directories_created_.find(dir.value()) == directories_created_.end()) {
-    ret = file_util::CreateDirectory(dir);
+    ret = base::CreateDirectory(dir);
     if (ret)
       directories_created_.insert(dir.value());
   }
   return ret;
 }