Refactor the guts of ResourceDispatcherHostImpl into a new class named

content/browser/renderer_host/redirect_to_file_resource_handler.h

Index: content/browser/renderer_host/redirect_to_file_resource_handler.h
===================================================================
--- content/browser/renderer_host/redirect_to_file_resource_handler.h	(revision 141889)
+++ content/browser/renderer_host/redirect_to_file_resource_handler.h	(working copy)
@@ -60,6 +60,7 @@
   void DidWriteToFile(int result);
   bool WriteMore();
   bool BufIsFull() const;
+  void ResumeIfDeferred();
 
   base::WeakPtrFactory<RedirectToFileResourceHandler> weak_factory_;
 
@@ -85,8 +86,7 @@
   // file created as  a result of the download.
   scoped_refptr<webkit_blob::ShareableFileReference> deletable_file_;
 
-  // True if OnRequestClosed() has already been called.
-  bool request_was_closed_;
+  bool did_defer_ ;
 
   bool completed_during_write_;
   net::URLRequestStatus completed_status_;