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

net/http/http_transaction.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 NET_HTTP_HTTP_TRANSACTION_H_
 #define NET_HTTP_HTTP_TRANSACTION_H_
 
 #include "net/base/completion_callback.h"
 #include "net/base/load_states.h"
 
@@ skipping 48 matching lines @@
   //
   // Response data is copied into the given buffer and the number of bytes
   // copied is returned.  ERR_IO_PENDING is returned if response data is not
   // yet available.  The CompletionCallback is notified when the data copy
   // completes, and it is passed the number of bytes that were successfully
   // copied.  Or, if a read error occurs, the CompletionCallback is notified of
   // the error.  Any other negative return value indicates that the transaction
   // could not be read.
   //
   // NOTE: The transaction is not responsible for deleting the callback object.
+  // If the operation is not completed immediately, the transaction must acquire
+  // a reference to the provided buffer.
   //
-  virtual int Read(char* buf, int buf_len, CompletionCallback* callback) = 0;
+  virtual int Read(IOBuffer* buf, int buf_len,
+                   CompletionCallback* callback) = 0;
 
   // Returns the response info for this transaction or NULL if the response
   // info is not available.
   virtual const HttpResponseInfo* GetResponseInfo() const = 0;
 
   // Returns the load state for this transaction.
   virtual LoadState GetLoadState() const = 0;
 
   // Returns the upload progress in bytes.  If there is no upload data,
   // zero will be returned.  This does not include the request headers.
   virtual uint64 GetUploadProgress() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_TRANSACTION_H_