Remove unused include in sequenced_worker_pool.h

net/nqe/socket_watcher_factory.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 NET_NQE_SOCKET_WATCHER_FACTORY_H_
 #define NET_NQE_SOCKET_WATCHER_FACTORY_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread_checker.h"
 #include "net/socket/socket_performance_watcher.h"
 #include "net/socket/socket_performance_watcher_factory.h"
 
 namespace base {
-class SingleThreadTaskRunner;
 class TimeDelta;
 }  // namespace base
 
 namespace net {
 
 namespace {
 typedef base::Callback<void(SocketPerformanceWatcherFactory::Protocol protocol,
                             const base::TimeDelta& rtt)>
     OnUpdatedRTTAvailableCallback;
 }
@@ skipping 27 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(SocketWatcherFactory);
 };
 
 }  // namespace internal
 
 }  // namespace nqe
 
 }  // namespace net
 
-#endif  // NET_NQE_SOCKET_WATCHER_FACTORY_H_
+#endif  // NET_NQE_SOCKET_WATCHER_FACTORY_H_