Automated IWYU fix for TaskRunner includes.

components/offline_pages/core/background/request_queue_store_sql.cc

 // 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.
 
 #include "components/offline_pages/core/background/request_queue_store_sql.h"
 
 #include <unordered_set>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/sequenced_task_runner.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/offline_pages/core/background/save_page_request.h"
 #include "sql/connection.h"
 #include "sql/statement.h"
 #include "sql/transaction.h"
 
 namespace offline_pages {
 
 template class StoreUpdateResult<SavePageRequest>;
 
@@ skipping 518 matching lines @@
   db_.reset();
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                 base::Bind(callback, success));
 }
 
 bool RequestQueueStoreSQL::CheckDb() const {
   return db_ && state_ == StoreState::LOADED;
 }
 
 }  // namespace offline_pages