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

chrome/browser/net/file_downloader.cc

 // 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.
 
 #include "chrome/browser/net/file_downloader.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_fetcher.h"
 #include "url/gurl.h"
 
 using content::BrowserThread;
 using net::URLFetcher;
 
 const int kNumRetries = 1;
@@ skipping 74 matching lines @@
 }
 
 void FileDownloader::OnFileMoveDone(bool success) {
   if (!success) {
     DLOG(WARNING) << "Could not move file to "
                   << local_path_.LossyDisplayName();
   }
 
   callback_.Run(success ? DOWNLOADED : FAILED);
 }