Automated IWYU fix for TaskRunner includes.

chrome/browser/safe_browsing/incident_reporting/download_metadata_manager_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 "chrome/browser/safe_browsing/incident_reporting/download_metadata_manager.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/run_loop.h"
+#include "base/sequenced_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/safe_browsing/csd.pb.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/download_manager.h"
 #include "content/public/test/mock_download_item.h"
 #include "content/public/test/mock_download_manager.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 585 matching lines @@
   // Allow everything to load into steady-state.
   RunAllTasks();
 
   // Open the zero-id item.
   zero_item_->NotifyObserversDownloadOpened();
 
   ShutdownDownloadManager();
 }
 
 }  // namespace safe_browsing