Move FileEnumerator to its own file, do some refactoring.

chrome/installer/util/shell_util_unittest.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/installer/util/shell_util.h"
 
 #include <vector>
 
 #include "base/base_paths.h"
 #include "base/base_paths_win.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/md5.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/string_util.h"
 #include "base/test/scoped_path_override.h"
 #include "base/test/test_shortcut_win.h"
 #include "base/win/shortcut.h"
 #include "base/win/windows_version.h"
 #include "chrome/installer/util/browser_distribution.h"
@@ skipping 497 matching lines @@
                   dist_, *test_properties_,
                   ShellUtil::SHELL_SHORTCUT_CREATE_ALWAYS));
   test_properties_->set_shortcut_name(L"A second shortcut");
   ASSERT_TRUE(ShellUtil::CreateOrUpdateShortcut(
                   ShellUtil::SHORTCUT_LOCATION_START_MENU,
                   dist_, *test_properties_,
                   ShellUtil::SHELL_SHORTCUT_CREATE_ALWAYS));
 
   base::FilePath shortcut_folder(
       fake_start_menu_.path().Append(dist_->GetAppShortCutName()));
-  file_util::FileEnumerator file_counter(shortcut_folder, false,
-                                         file_util::FileEnumerator::FILES);
+  base::FileEnumerator file_counter(shortcut_folder, false,
+                                    base::FileEnumerator::FILES);
   int count = 0;
   while (!file_counter.Next().empty())
     ++count;
   EXPECT_EQ(2, count);
 
   ASSERT_TRUE(file_util::PathExists(shortcut_folder));
   ASSERT_TRUE(ShellUtil::RemoveShortcuts(
       ShellUtil::SHORTCUT_LOCATION_START_MENU, dist_, ShellUtil::CURRENT_USER,
       chrome_exe_));
   ASSERT_FALSE(file_util::PathExists(shortcut_folder));
@@ skipping 97 matching lines @@
 
   const string16 expected[] = { L"", L"MY", L"MZXQ", L"MZXW6", L"MZXW6YQ",
                                 L"MZXW6YTB", L"MZXW6YTBOI"};
 
   // Run the tests, with one more letter in the input every pass.
   for (int i = 0; i < arraysize(expected); ++i) {
     ASSERT_EQ(expected[i],
               ShellUtil::ByteArrayToBase32(test_array, i));
   }
 }