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

net/url_request/url_request.h

Index: net/url_request/url_request.h
===================================================================
--- net/url_request/url_request.h	(revision 8697)
+++ net/url_request/url_request.h	(working copy)
@@ -21,6 +21,9 @@
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_status.h"
 
+namespace net {
+class IOBuffer;
+}
 class URLRequestJob;
 
 // This stores the values of the Set-Cookie headers received during the request.
@@ -367,16 +370,14 @@
   // successful status.
   // If data is available, Read will return true, and the data and length will
   // be returned immediately.  If data is not available, Read returns false,
-  // and an asynchronous Read is initiated.  The caller guarantees the
-  // buffer provided will be available until the Read is finished.  The
-  // Read is finished when the caller receives the OnReadComplete
-  // callback.  OnReadComplete will be always be called, even if there
-  // was a failure.
+  // and an asynchronous Read is initiated.  The Read is finished when
+  // the caller receives the OnReadComplete callback.  OnReadComplete will be
+  // always be called, even if there was a failure.
   //
-  // The buf parameter is a buffer to receive the data.  Once the read is
-  // initiated, the caller guarantees availability of this buffer until
-  // the OnReadComplete is received.  The buffer must be at least
-  // max_bytes in length.
+  // The buf parameter is a buffer to receive the data.  If the operation
+  // completes asynchronously, the implementation will reference the buffer
+  // until OnReadComplete is called.  The buffer must be at least max_bytes in
+  // length.
   //
   // The max_bytes parameter is the maximum number of bytes to read.
   //
@@ -386,7 +387,7 @@
   //
   // If a read error occurs, Read returns false and the request->status
   // will be set to an error.
-  bool Read(char* buf, int max_bytes, int *bytes_read);
+  bool Read(net::IOBuffer* buf, int max_bytes, int *bytes_read);
 
   // One of the following two methods should be called in response to an
   // OnAuthRequired() callback (and only then).