Adds the new URLRequest::OnBeforeNetworkStart hook to the

content/browser/download/download_resource_handler.cc

Index: content/browser/download/download_resource_handler.cc
diff --git a/content/browser/download/download_resource_handler.cc b/content/browser/download/download_resource_handler.cc
index 9f00ef660b53a4a43cecf1eb89f6eabde3e3cb71..ef2df1cef4d833c76feff5f200349db310c54434 100644
--- a/content/browser/download/download_resource_handler.cc
+++ b/content/browser/download/download_resource_handler.cc
@@ -222,6 +222,12 @@ bool DownloadResourceHandler::OnWillStart(int request_id,
   return true;
 }
 
+bool DownloadResourceHandler::OnBeforeNetworkStart(int request_id,
+                                                   const GURL& url,
+                                                   bool* defer) {
+  return true;
+}
+
 // Create a new buffer, which will be handed to the download thread for file
 // writing and deletion.
 bool DownloadResourceHandler::OnWillRead(int request_id,