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

chrome/browser/renderer_host/download_throttling_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_THROTTLING_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_THROTTLING_RESOURCE_HANDLER_H_
 
 #include <string>
 
 #include "chrome/browser/renderer_host/resource_handler.h"
@@ skipping 22 matching lines @@
                                     int request_id,
                                     bool in_complete);
   virtual ~DownloadThrottlingResourceHandler();
 
   // ResourceHanlder implementation:
   virtual bool OnUploadProgress(int request_id,
                                 uint64 position,
                                 uint64 size);
   virtual bool OnRequestRedirected(int request_id, const GURL& url);
   virtual bool OnResponseStarted(int request_id, ResourceResponse* response);
-  virtual bool OnWillRead(int request_id,
-                          char** buf,
-                          int* buf_size,
+  virtual bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
                           int min_size);
   virtual bool OnReadCompleted(int request_id, int* bytes_read);
   virtual bool OnResponseCompleted(int request_id,
                                    const URLRequestStatus& status);
 
   // DownloadRequestManager::Callback implementation:
   void CancelDownload();
   void ContinueDownload();
 
  private:
   void CopyTmpBufferToDownloadHandler();
 
   ResourceDispatcherHost* host_;
   URLRequest* request_;
   std::string url_;
   int render_process_host_id_;
   int render_view_id_;
   int request_id_;
 
   // Handles the actual download. This is only created if the download is
   // allowed to continue.
   scoped_refptr<DownloadResourceHandler> download_handler_;
 
   // Response supplied to OnResponseStarted. Only non-null if OnResponseStarted
   // is invoked.
   scoped_refptr<ResourceResponse> response_;
 
   // If we're created by way of BufferedEventHandler we'll get one request for
   // a buffer. This is that buffer.
-  scoped_array<char> tmp_buffer_;
+  scoped_refptr<net::IOBuffer> tmp_buffer_;
   int tmp_buffer_length_;
 
   // If true the next call to OnReadCompleted is ignored. This is used if we're
   // paused during a call to OnReadCompleted. Pausing during OnReadCompleted
   // results in two calls to OnReadCompleted for the same data. This make sure
   // we ignore one of them.
   bool ignore_on_read_complete_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadThrottlingResourceHandler);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_THROTTLING_RESOURCE_HANDLER_H_