Move FileEnumerator to its own file, do some refactoring.

chrome/browser/extensions/api/developer_private/developer_private_api.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/extensions/api/developer_private/developer_private_api.h"
 
 #include "base/base64.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/i18n/file_util_icu.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/extensions/api/developer_private/developer_private_api_factory.h"
 #include "chrome/browser/extensions/api/developer_private/entry_picker.h"
 #include "chrome/browser/extensions/extension_disabled_ui.h"
 #include "chrome/browser/extensions/extension_error_reporter.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 53 matching lines @@
 
   std::string contents_base64;
   if (!base::Base64Encode(contents, &contents_base64))
     return GURL();
 
   const char kDataURLPrefix[] = "data:image;base64,";
   return GURL(kDataURLPrefix + contents_base64);
 }
 
 std::vector<base::FilePath> ListFolder(const base::FilePath path) {
-  file_util::FileEnumerator files(path, false,
-      file_util::FileEnumerator::DIRECTORIES
-      | file_util::FileEnumerator::FILES);
+  base::FileEnumerator files(path, false,
+      base::FileEnumerator::DIRECTORIES | base::FileEnumerator::FILES);
   std::vector<base::FilePath> paths;
 
   for (base::FilePath current_path = files.Next(); !current_path.empty();
        current_path = files.Next()) {
     paths.push_back(current_path);
   }
   return paths;
 }
 
 bool ValidateFolderName(const base::FilePath::StringType& name) {
@@ skipping 1184 matching lines @@
 
   #undef   SET_STRING
   return true;
 }
 
 DeveloperPrivateGetStringsFunction::~DeveloperPrivateGetStringsFunction() {}
 
 } // namespace api
 
 } // namespace extensions