Revert of Remove header dependencies from sequence_checker.h to sequenced_worker_pool.h

chrome/browser/chromeos/arc/fileapi/arc_content_file_system_file_stream_reader.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 "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_file_stream_reader.h"
 
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "base/files/file.h"
-#include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_restrictions.h"
 #include "chrome/browser/chromeos/arc/fileapi/arc_file_system_operation_runner_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "mojo/edk/embedder/embedder.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 
 namespace arc {
 
 namespace {
@@ skipping 182 matching lines @@
     callback.Run(net::ERR_FAILED);
     return;
   }
   DCHECK_GE(num_bytes_to_consume, read_result);
   num_bytes_to_consume -= read_result;
   ConsumeFileContents(buf, buffer_length, callback, temporary_buffer,
                       num_bytes_to_consume);
 }
 
 }  // namespace arc