Move FileEnumerator to its own file, do some refactoring.

chrome/browser/importer/firefox3_importer.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/importer/firefox3_importer.h"
 
 #include <set>
 
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/importer/firefox2_importer.h"
 #include "chrome/browser/importer/firefox_importer_utils.h"
 #include "chrome/browser/importer/importer_bridge.h"
@@ skipping 392 matching lines @@
   // Firefox.
   base::FilePath locale_app_path = app_path.AppendASCII(locale_);
   base::FilePath default_locale_app_path = app_path.AppendASCII("en-US");
   if (file_util::DirectoryExists(locale_app_path))
     app_path = locale_app_path;
   else if (file_util::DirectoryExists(default_locale_app_path))
     app_path = default_locale_app_path;
 #endif
 
   // Get search engine definition from file system.
-  file_util::FileEnumerator engines(app_path, false,
-                                    file_util::FileEnumerator::FILES);
+  base::FileEnumerator engines(app_path, false, base::FileEnumerator::FILES);
   for (base::FilePath engine_path = engines.Next();
        !engine_path.value().empty(); engine_path = engines.Next()) {
     files->push_back(engine_path);
   }
 }
 
 void Firefox3Importer::LoadRootNodeID(sql::Connection* db,
                                       int* toolbar_folder_id,
                                       int* menu_folder_id,
                                       int* unsorted_folder_id) {
@@ skipping 128 matching lines @@
 
       if (!importer::ReencodeFavicon(&data[0], data.size(), &usage.png_data))
         continue;  // Unable to decode.
 
       usage.urls = i->second;
       favicons->push_back(usage);
     }
     s.Reset(true);
   }
 }