[Housekeeping] Move file IO to slow pool.

net/url_request/url_request_simple_job.cc

 // Copyright (c) 2012 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 "net/url_request/url_request_simple_job.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 18 matching lines @@
               int64_t data_offset) {
   memcpy(buf->data(), data->front() + data_offset, buf_size);
 }
 
 }  // namespace
 
 URLRequestSimpleJob::URLRequestSimpleJob(URLRequest* request,
                                          NetworkDelegate* network_delegate)
     : URLRangeRequestJob(request, network_delegate),
       next_data_offset_(0),
-      task_runner_(base::WorkerPool::GetTaskRunner(false)),
-      weak_factory_(this) {
-}
+      task_runner_(base::WorkerPool::GetTaskRunner(true)),
+      weak_factory_(this) {}
 
 void URLRequestSimpleJob::Start() {
   // Start reading asynchronously so that all error reporting and data
   // callbacks happen as they would for network requests.
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&URLRequestSimpleJob::StartAsync, weak_factory_.GetWeakPtr()));
 }
 
 void URLRequestSimpleJob::Kill() {
@@ skipping 86 matching lines @@
     next_data_offset_ = byte_range_.first_byte_position();
     set_expected_content_size(byte_range_.last_byte_position() -
                               next_data_offset_ + 1);
     NotifyHeadersComplete();
   } else {
     NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED, result));
   }
 }
 
 }  // namespace net