Stop working around issue 7781 in Pub.

utils/pub/command_uploader.dart

 // 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.
 
 library command_uploader;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:uri';
 
@@ skipping 59 matching lines @@
           var url = server.resolve("/packages/${encodeUriComponent(package)}"
               "/uploaders.json");
           return client.post(url, fields: {"email": uploader});
         } else { // command == 'remove'
           var url = server.resolve("/packages/${encodeUriComponent(package)}"
               "/uploaders/${encodeUriComponent(uploader)}.json");
           return client.delete(url);
         }
       });
     }).then(handleJsonSuccess).catchError((asyncError) {
-      var e = getRealError(asyncError);
-      if (e is! PubHttpException) throw asyncError;
-      handleJsonError(e.response);
+      if (asyncError.error is! PubHttpException) throw asyncError;
+      handleJsonError(asyncError.error.response);
     });
   }
 }