Remove unused include in sequenced_worker_pool.h

net/ssl/ssl_platform_key.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 NET_SSL_SSL_PLATFORM_KEY_H_
 #define NET_SSL_SSL_PLATFORM_KEY_H_
 
 #include <memory>
 
-#include "base/lazy_instance.h"
 #include "base/memory/ref_counted.h"
 #include "net/base/net_export.h"
 
-namespace base {
-class SequencedTaskRunner;
-}
-
 namespace net {
 
 class SSLPrivateKey;
 class X509Certificate;
 
 // Looks up the private key from the platform key store corresponding to
 // |certificate|'s public key and returns an SSLPrivateKey backed by the
 // playform key.
 NET_EXPORT scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
     X509Certificate* certificate);
 
 }  // namespace net
 
 #endif  // NET_SSL_SSL_PLATFORM_KEY_H_