Move FileEnumerator to its own file, do some refactoring.

chrome/browser/component_updater/widevine_cdm_component_installer.cc

 // Copyright (c) 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/component_updater/widevine_cdm_component_installer.h"
 
 #include <string.h>
 
 #include <vector>
 
 #include "base/base_paths.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "build/build_config.h"
 #include "chrome/browser/component_updater/component_updater_service.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "chrome/common/chrome_constants.h"
@@ skipping 60 matching lines @@
 // directories to find the full path.
 // On success, |latest_dir| returns something like:
 // <profile>\AppData\Local\Google\Chrome\User Data\WidevineCdm\10.3.44.555\.
 // |latest_version| returns the corresponding version number. |older_dirs|
 // returns directories of all older versions.
 bool GetWidevineCdmDirectory(base::FilePath* latest_dir,
                              base::Version* latest_version,
                              std::vector<base::FilePath>* older_dirs) {
   base::FilePath base_dir = GetWidevineCdmBaseDirectory();
   bool found = false;
-  file_util::FileEnumerator file_enumerator(
-      base_dir, false, file_util::FileEnumerator::DIRECTORIES);
+  base::FileEnumerator file_enumerator(
+      base_dir, false, base::FileEnumerator::DIRECTORIES);
   for (base::FilePath path = file_enumerator.Next(); !path.value().empty();
        path = file_enumerator.Next()) {
     base::Version version(path.BaseName().MaybeAsASCII());
     if (!version.IsValid())
       continue;
     if (found) {
       if (version.CompareTo(*latest_version) > 0) {
         older_dirs->push_back(*latest_dir);
         *latest_dir = path;
         *latest_version = version;
@@ skipping 187 matching lines @@
 #endif  // defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
 
 }  // namespace
 
 void RegisterWidevineCdmComponent(ComponentUpdateService* cus) {
 #if defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
                           base::Bind(&StartWidevineCdmUpdateRegistration, cus));
 #endif  // defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
 }