Allows prefetch requests to live beyond the renderer by delaying

content/browser/loader/async_resource_handler.h

Index: content/browser/loader/async_resource_handler.h
diff --git a/content/browser/loader/async_resource_handler.h b/content/browser/loader/async_resource_handler.h
index 0992841612746a7c0cc8288d3d4456fcddb6b2fa..e8341711922fd0ca167dcc929aedaa9e6357538c 100644
--- a/content/browser/loader/async_resource_handler.h
+++ b/content/browser/loader/async_resource_handler.h
@@ -62,6 +62,12 @@ class AsyncResourceHandler : public ResourceHandler,
   virtual void OnDataDownloaded(int request_id,
                                 int bytes_downloaded) OVERRIDE;
 
+  // Once detached, no more data is sent to the renderer process. Only
+  // completion and error notification. This is useful for prefetches where the
+  // render process does not need the data and the download may persist longer
+  // than the render process.
+  void DetachReads();
+
  private:
   // IPC message handlers:
   void OnFollowRedirect(int request_id,
@@ -87,6 +93,7 @@ class AsyncResourceHandler : public ResourceHandler,
   bool has_checked_for_sufficient_resources_;
   bool sent_received_response_msg_;
   bool sent_first_data_msg_;
+  bool detached_reads_;
 
   DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
 };