Move FileEnumerator to its own file, do some refactoring.

chrome/installer/util/shell_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.
 //
 // This file defines functions that integrate Chrome in Windows shell. These
 // functions can be used by Chrome as well as Chrome installer. All of the
 // work is done by the local functions defined in anonymous namespace in
 // this class.
 
 #include "chrome/installer/util/shell_util.h"
 
 #include <windows.h>
 #include <shlobj.h>
 
 #include <limits>
 #include <string>
 
 #include "base/bind.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/lazy_instance.h"
 #include "base/logging.h"
 #include "base/md5.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/path_service.h"
 #include "base/string16.h"
 #include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 1193 matching lines @@
                          const base::FilePath& target_exe) {
   DCHECK(!shortcut_operation.is_null());
   base::FilePath shortcut_folder;
   if (!ShellUtil::GetShortcutPath(location, dist, level, &shortcut_folder)) {
     LOG(WARNING) << "Cannot find path at location " << location;
     return false;
   }
 
   bool success = true;
   InstallUtil::ProgramCompare target_compare(target_exe);
-  file_util::FileEnumerator enumerator(
-      shortcut_folder, false, file_util::FileEnumerator::FILES,
+  base::FileEnumerator enumerator(
+      shortcut_folder, false, base::FileEnumerator::FILES,
       string16(L"*") + installer::kLnkExt);
   base::FilePath target_path;
   for (base::FilePath shortcut_path = enumerator.Next();
        !shortcut_path.empty();
        shortcut_path = enumerator.Next()) {
     if (base::win::ResolveShortcut(shortcut_path, &target_path, NULL)) {
       if (target_compare.EvaluatePath(target_path) &&
           !shortcut_operation.Run(shortcut_path)) {
         success = false;
       }
@@ skipping 834 matching lines @@
     // are any left...).
     if (free_bits >= 8 && next_byte_index < size) {
       free_bits -= 8;
       bit_stream += bytes[next_byte_index++] << free_bits;
     }
   }
 
   DCHECK_EQ(ret.length(), encoded_length);
   return ret;
 }