Remove unused include in sequenced_worker_pool.h

blimp/engine/renderer/frame_scheduler.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_ENGINE_RENDERER_FRAME_SCHEDULER_H_
 #define BLIMP_ENGINE_RENDERER_FRAME_SCHEDULER_H_
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "base/timer/timer.h"
 
 namespace blimp {
 namespace engine {
 
 class FrameSchedulerClient {
  public:
   virtual ~FrameSchedulerClient() {}
 
   // Used to notify the SchedulerClient to start the requested frame update.
@@ skipping 67 matching lines @@
 
   FrameSchedulerClient* client_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameScheduler);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_RENDERER_FRAME_SCHEDULER_H_