Remove deprecated_addNit.

pkg/front_end/tool/_fasta/generate_messages.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:io';
 
 import 'dart:isolate';
 
 import 'package:yaml/yaml.dart' show loadYaml;
 
@@ skipping 87 matching lines @@
 
       case "#uri":
         parameters.add("Uri uri_");
         conversions.add("String uri = relativizeUri(uri_);");
         arguments.add("'uri': uri_");
         break;
 
       case "#uri2":
         parameters.add("Uri uri2_");
         conversions.add("String uri2 = relativizeUri(uri2_);");
-        arguments.add("'uri': uri2_");
+        arguments.add("'uri2': uri2_");
         break;
 
       default:
         throw "Unhandled placeholder in template: ${match[0]}";
     }
   }
 
   String interpolate(String name, String text) {
     return "$name: "
         "\"\"\"${text.replaceAll(r'$', r'\$').replaceAll('#', '\$')}\"\"\"";
@@ skipping 55 matching lines @@
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 Message _withArguments$name(${parameters.join(', ')}) {
   ${conversions.join('\n  ')}
   return new Message(
      code$name,
      ${messageArguments.join(', ')});
 }
 """;
 }