Add missing #include around sequenced_worker_pool.h

services/service_manager/runner/host/service_process_launcher_unittest.cc

 // Copyright 2014 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 "services/service_manager/runner/host/service_process_launcher.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace service_manager {
 namespace {
 
 const char kTestServiceName[] = "host_test_service";
 
 #if defined(OS_WIN)
 const base::FilePath::CharType kServiceExtension[] =
     FILE_PATH_LITERAL(".service.exe");
@@ skipping 63 matching lines @@
   run_loop.Run();
 
   launcher.Join();
   blocking_pool->Shutdown();
 
   EXPECT_EQ(1u, service_process_launcher_delegate.get_and_clear_adjust_count());
 }
 
 }  // namespace
 }  // namespace service_manager