backing out last checkin, tree's red

uriloader/exthandler/nsExternalHelperAppService.cpp

@@ -1215,9 +1215,6 @@ NS_IMETHODIMP nsExternalHelperAppService::LoadURI(nsIURI * aURL, nsIPrompt * aPr
   nsCAutoString spec;
   aURL->GetSpec(spec);
 
-  if (spec.Find("%00") != -1)
-    return NS_ERROR_MALFORMED_URI;
-
   spec.ReplaceSubstring("\"", "%22");
   spec.ReplaceSubstring("`", "%60");