Move FileEnumerator to its own file, do some refactoring.

chrome/test/perf/generate_profile.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/test/perf/generate_profile.h"
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/i18n/icu_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/history/history_service.h"
@@ skipping 223 matching lines @@
     // Run all pending messages to give TopSites a chance to catch up.
     message_loop.RunUntilIdle();
     page_id += batch_size;
   }
 
   profile.DestroyTopSites();
   profile.DestroyHistoryService();
 
   message_loop.RunUntilIdle();
 
-  file_util::FileEnumerator file_iterator(profile.GetPath(), false,
-      file_util::FileEnumerator::FILES);
+  base::FileEnumerator file_iterator(profile.GetPath(), false,
+                                     base::FileEnumerator::FILES);
   base::FilePath path = file_iterator.Next();
   while (!path.empty()) {
     base::FilePath dst_file = dst_dir.Append(path.BaseName());
     file_util::Delete(dst_file, false);
     if (!file_util::CopyFile(path, dst_file)) {
       PLOG(ERROR) << "Copying file failed";
       return false;
     }
     path = file_iterator.Next();
   }
 
   printf("Finished creating profiles for testing.\n");
 
   // Restore the random seed.
   srand(static_cast<unsigned int>(Time::Now().ToInternalValue()));
 
   return true;
 }