Clean up ResourceHandler API.

content/browser/download/download_resource_handler.h

Index: content/browser/download/download_resource_handler.h
diff --git a/content/browser/download/download_resource_handler.h b/content/browser/download/download_resource_handler.h
index ffbd92bfb3a10fe120b134989ffcafddce2cef24..11982d7f67f0cecd019252607fdd2dc120e8b245 100644
--- a/content/browser/download/download_resource_handler.h
+++ b/content/browser/download/download_resource_handler.h
@@ -67,7 +67,7 @@ class CONTENT_EXPORT DownloadResourceHandler
   // Create a new buffer, which will be handed to the download thread for file
   // writing and deletion.
   virtual bool OnWillRead(int request_id,
-                          net::IOBuffer** buf,
+                          scoped_refptr<net::IOBuffer>* buf,
                           int* buf_size,
                           int min_size) OVERRIDE;
 
@@ -105,7 +105,6 @@ class CONTENT_EXPORT DownloadResourceHandler
   uint32 download_id_;
   std::string content_disposition_;
   int64 content_length_;
-  net::URLRequest* request_;
   // This is read only on the IO thread, but may only
   // be called on the UI thread.
   DownloadUrlParameters::OnStartedCallback started_cb_;