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

chrome/browser/renderer_host/save_file_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_SAVE_FILE_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_SAVE_FILE_RESOURCE_HANDLER_H_
 
 #include <string>
 
 #include "chrome/browser/renderer_host/resource_handler.h"
@@ skipping 10 matching lines @@
 
   // Saves the redirected URL to final_url_, we need to use the original
   // URL to match original request.
   bool OnRequestRedirected(int request_id, const GURL& url);
 
   // Sends the download creation information to the download thread.
   bool OnResponseStarted(int request_id, ResourceResponse* response);
 
   // Creates 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);
 
   // Passes the buffer to the download file writer.
   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), StringToInt64 returns 0, which indicates 'unknown size' and
   // is handled correctly by the SaveManager.
   void set_content_length(const std::string& content_length) {
     content_length_ = StringToInt64(content_length);
   }
 
   void set_content_disposition(const std::string& content_disposition) {
     content_disposition_ = content_disposition;
   }
 
  private:
   int save_id_;
   int render_process_id_;
   int render_view_id_;
-  char* read_buffer_;
+  scoped_refptr<net::IOBuffer> read_buffer_;
   std::string content_disposition_;
   std::wstring url_;
   std::wstring final_url_;
   int64 content_length_;
   SaveFileManager* save_manager_;
 
   static const int kReadBufSize = 32768;  // bytes
 
   DISALLOW_COPY_AND_ASSIGN(SaveFileResourceHandler);
 };
 #endif  // CHROME_BROWSER_RENDERER_HOST_SAVE_FILE_RESOURCE_HANDLER_H_