Remove unused include in sequenced_worker_pool.h

components/drive/chromeos/resource_metadata.h

 // 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.
 
 #ifndef COMPONENTS_DRIVE_CHROMEOS_RESOURCE_METADATA_H_
 #define COMPONENTS_DRIVE_CHROMEOS_RESOURCE_METADATA_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"
 #include "base/threading/thread_checker.h"
 #include "components/drive/file_errors.h"
 #include "components/drive/resource_metadata_storage.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace drive {
 
@@ skipping 113 matching lines @@
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceMetadata);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // COMPONENTS_DRIVE_CHROMEOS_RESOURCE_METADATA_H_