Reduce header dependencies in net/

net/url_request/url_request_simple_job.cc

 // Copyright (c) 2006-2008 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 "base/message_loop.h"
+#include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/url_request/url_request_status.h"
 
 URLRequestSimpleJob::URLRequestSimpleJob(URLRequest* request)
     : URLRequestJob(request),
       data_offset_(0) {
 }
 
 void URLRequestSimpleJob::Start() {
   // Start reading asynchronously so that all error reporting and data
@@ skipping 30 matching lines @@
 
   if (GetData(&mime_type_, &charset_, &data_)) {
     // Notify that the headers are complete
     NotifyHeadersComplete();
   } else {
     // what should the error code be?
     NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED,
                                       net::ERR_INVALID_URL));
   }
 }