[net/base] Forward declaration of classes instead of including header

net/base/directory_lister_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 <list>
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/i18n/file_util_icu.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "net/base/directory_lister.h"
 #include "net/base/net_errors.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 namespace net {
 
 namespace {
@@ skipping 261 matching lines @@
   ListerDelegate delegate(DirectoryLister::ALPHA_DIRS_FIRST);
   DirectoryLister lister(
       tempDir.path().AppendASCII("this_path_does_not_exist"), &delegate);
   delegate.Run(&lister);
 
   EXPECT_EQ(ERR_FILE_NOT_FOUND, delegate.error());
   EXPECT_EQ(0, delegate.num_files());
 }
 
 }  // namespace net