Remove unused include in sequenced_worker_pool.h

components/drive/file_system/get_file_for_saving_operation_unittest.cc

 // Copyright 2013 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 "components/drive/chromeos/file_system/get_file_for_saving_operation.h"
 
 #include <stdint.h>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/task_runner_util.h"
 #include "components/drive/drive.pb.h"
 #include "components/drive/file_change.h"
 #include "components/drive/file_errors.h"
 #include "components/drive/file_system/operation_test_base.h"
 #include "components/drive/file_write_watcher.h"
 #include "components/drive/job_scheduler.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/test/test_utils.h"
 #include "google_apis/drive/test_util.h"
@@ skipping 128 matching lines @@
       google_apis::test_util::CreateCopyResultCallback(
           &error, &local_path, &entry));
   content::RunAllBlockingPoolTasksUntilIdle();
 
   // Checks that an error is returned.
   EXPECT_EQ(FILE_ERROR_EXISTS, error);
 }
 
 }  // namespace file_system
 }  // namespace drive