Change URLRequest to use a ref-counted buffer for actual IO....

chrome/browser/renderer_host/download_resource_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_
 
 #include <string>
 
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
@@ skipping 14 matching lines @@
                           bool save_as);
 
   // Not needed, as this event handler ought to be the final resource.
   bool OnRequestRedirected(int request_id, const GURL& url);
 
   // Send the download creation information to the download thread.
   bool OnResponseStarted(int request_id, ResourceResponse* response);
 
   // Create a new buffer, which will be handed to the download thread for file
   // writing and deletion.
-  bool OnWillRead(int request_id, char** buf, int* buf_size, int min_size);
+  bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
+                  int min_size);
 
   bool OnReadCompleted(int request_id, int* bytes_read);
 
   bool OnResponseCompleted(int request_id, const URLRequestStatus& status);
 
   // If the content-length header is not present (or contains something other
   // than numbers), the incoming content_length is -1 (unknown size).
   // Set the content length to 0 to indicate unknown size to DownloadManager.
   void set_content_length(const int64& content_length);
 
   void set_content_disposition(const std::string& content_disposition);
 
   void CheckWriteProgress();
 
  private:
   void StartPauseTimer();
 
   int download_id_;
   ResourceDispatcherHost::GlobalRequestID global_id_;
   int render_view_id_;
-  char* read_buffer_;
+  scoped_refptr<net::IOBuffer> read_buffer_;
   std::string content_disposition_;
   std::wstring url_;
   int64 content_length_;
   DownloadFileManager* download_manager_;
   URLRequest* request_;
   bool save_as_;  // Request was initiated via "Save As" by the user.
   DownloadBuffer* buffer_;
   ResourceDispatcherHost* rdh_;
   bool is_paused_;
   base::OneShotTimer<DownloadResourceHandler> pause_timer_;
 
   static const int kReadBufSize = 32768;  // bytes
   static const size_t kLoadsToWrite = 100;  // number of data buffers queued
   static const int kThrottleTimeMs = 200;  // milliseconds
 
   DISALLOW_COPY_AND_ASSIGN(DownloadResourceHandler);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_