Stop working around issue 7781 in Pub.

utils/pub/command_uploader.dart

Index: utils/pub/command_uploader.dart
diff --git a/utils/pub/command_uploader.dart b/utils/pub/command_uploader.dart
index ef37210b975be86baa71a43ec93575cd84ea9b1c..eb3cd4ac0f0a685429a09efc37d590d82158c646 100644
--- a/utils/pub/command_uploader.dart
+++ b/utils/pub/command_uploader.dart
@@ -77,9 +77,8 @@ class UploaderCommand extends PubCommand {
         }
       });
     }).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);
     });
   }
 }