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

chrome/browser/download/save_file_manager.h

Index: chrome/browser/download/save_file_manager.h
===================================================================
--- chrome/browser/download/save_file_manager.h	(revision 8565)
+++ chrome/browser/download/save_file_manager.h	(working copy)
@@ -66,6 +66,9 @@
 #include "base/thread.h"
 #include "chrome/browser/download/save_types.h"
 
+namespace net {
+class IOBuffer;
+}
 class GURL;
 class SaveFile;
 class SavePackage;
@@ -101,7 +104,7 @@
 
   // Notifications sent from the IO thread and run on the file thread:
   void StartSave(SaveFileCreateInfo* info);
-  void UpdateSaveProgress(int save_id, char* data, int size);
+  void UpdateSaveProgress(int save_id, net::IOBuffer* data, int size);
   void SaveFinished(int save_id, std::wstring save_url,
                     int render_process_id, bool is_success);