Remove unused include in sequenced_worker_pool.h

blimp/client/core/context/assignment_fetcher.h

 // Copyright 2016 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 BLIMP_CLIENT_CORE_CONTEXT_ASSIGNMENT_FETCHER_H_
 #define BLIMP_CLIENT_CORE_CONTEXT_ASSIGNMENT_FETCHER_H_
 
 #include <memory>
 #include <string>
 
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "blimp/client/core/session/assignment_source.h"
 #include "blimp/client/core/session/identity_source.h"
 
 namespace blimp {
 namespace client {
 
 class AssignmentFetcher {
  public:
   using AuthErrorCallback = base::Callback<void(const GoogleServiceAuthError&)>;
   using AssignmentResultCallback =
@@ skipping 37 matching lines @@
   // The task runner to use for file operations.
   scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(AssignmentFetcher);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_CORE_CONTEXT_ASSIGNMENT_FETCHER_H_