[Downloads] Factor out request handling logic between DRH and UD.

content/browser/download/download_create_info.h

Index: content/browser/download/download_create_info.h
diff --git a/content/browser/download/download_create_info.h b/content/browser/download/download_create_info.h
index 7bf03ab1d2a1fe28194095ac991ff0986361b965..406f4a1a308fee39dfcf6e525b1a6042ea04078e 100644
--- a/content/browser/download/download_create_info.h
+++ b/content/browser/download/download_create_info.h
@@ -27,8 +27,6 @@ struct CONTENT_EXPORT DownloadCreateInfo {
   DownloadCreateInfo(const base::Time& start_time,
                      int64 total_bytes,
                      const net::BoundNetLog& bound_net_log,
-                     bool has_user_gesture,
-                     ui::PageTransition transition_type,
                      scoped_ptr<DownloadSaveInfo> save_info);
   DownloadCreateInfo();
   ~DownloadCreateInfo();
@@ -92,7 +90,7 @@ struct CONTENT_EXPORT DownloadCreateInfo {
   std::string remote_address;
 
   // The handle to the URLRequest sourcing this download.
-  DownloadRequestHandle request_handle;
+  scoped_ptr<DownloadRequestHandleInterface> request_handle;
 
   // The request's |BoundNetLog|, for "source_dependency" linking with the
   // download item's.