Update dom streams with new signatures.

tools/dom/templates/html/impl/impl_XMLHttpRequest.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of $LIBRARYNAME;
 
 /**
  * A utility for retrieving data from a URL.
  *
  * HttpRequest can be used to obtain data from http, ftp, and file
@@ skipping 142 matching lines @@
     xhr.onLoad.listen((e) {
       // Note: file:// URIs have status of 0.
       if ((xhr.status >= 200 && xhr.status < 300) ||
           xhr.status == 0 || xhr.status == 304) {
         completer.complete(xhr);
       } else {
         completer.completeError(e);
       }
     });
 
-    xhr.onError.listen((e) {
-      completer.completeError(e);
-    });
+    xhr.onError.listen(completer.completeError);
 
     if (sendData != null) {
       xhr.send(sendData);
     } else {
       xhr.send();
     }
 
     return completer.future;
   }
 
@@ skipping 91 matching lines @@
     } else {
       JS('', '#.send()', xhr);
     }
 
     return completer.future;
 $endif
   }
 
 $!MEMBERS
 }