Remove unused include in sequenced_worker_pool.h

components/sync/model_impl/model_type_store_impl.h

 // Copyright 2015 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_SYNC_MODEL_IMPL_MODEL_TYPE_STORE_IMPL_H_
 #define COMPONENTS_SYNC_MODEL_IMPL_MODEL_TYPE_STORE_IMPL_H_
 
 #include <memory>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/sequenced_task_runner.h"
 #include "base/threading/non_thread_safe.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/model/model_type_store.h"
 
 namespace leveldb {
 class WriteBatch;
 }  // namespace leveldb
 
 namespace syncer {
 
@@ skipping 91 matching lines @@
   // Key prefix for data/metadata records of this model type.
   const std::string data_prefix_;
   const std::string metadata_prefix_;
 
   base::WeakPtrFactory<ModelTypeStoreImpl> weak_ptr_factory_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_MODEL_IMPL_MODEL_TYPE_STORE_IMPL_H_