Add missing #include around sequenced_worker_pool.h in //chrome

chrome/browser/policy/cloud/test_request_interceptor.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/policy/cloud/test_request_interceptor.h"
 
 #include <limits>
 #include <memory>
 #include <queue>
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/sequenced_task_runner.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/base/net_errors.h"
 #include "net/base/upload_bytes_element_reader.h"
 #include "net/base/upload_data_stream.h"
 #include "net/base/upload_element_reader.h"
 #include "net/test/url_request/url_request_mock_http_job.h"
 #include "net/url_request/url_request_error_job.h"
 #include "net/url_request/url_request_filter.h"
 #include "net/url_request/url_request_interceptor.h"
@@ skipping 307 matching lines @@
       FROM_HERE,
       base::Bind(
           base::IgnoreResult(&base::TaskRunner::PostTask),
           base::ThreadTaskRunnerHandle::Get(),
           FROM_HERE,
           run_loop.QuitClosure()));
   run_loop.Run();
 }
 
 }  // namespace policy