Roll to pickup pool changes

packages/barback/example/lazy_transformer/lib/transformer.dart

 // Copyright (c) 2014, 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 'package:barback/barback.dart';
 
 import 'dart:async';
 
 class CodedMessageConverter extends Transformer implements LazyTransformer {
-
   // A constructor named "asPlugin" is required. It can be empty, but
   // it must be present.
   CodedMessageConverter.asPlugin();
 
   Future<bool> isPrimary(AssetId id) async => id.extension == '.txt';
 
-  Future declareOutputs(DeclaringTransform transform) {
+  void declareOutputs(DeclaringTransform transform) {
     transform.declareOutput(transform.primaryId.changeExtension('.shhhhh'));
   }
 
   Future apply(Transform transform) async {
     var content = await transform.primaryInput.readAsString();
 
     // The output file is created with the '.shhhhh' extension.
     var id = transform.primaryInput.id.changeExtension('.shhhhh');
 
     var newContent = new StringBuffer();
     for (var i = 0; i < content.length; i++) {
       newContent.write(rot13(content[i]));
     }
     transform.addOutput(new Asset.fromString(id, newContent.toString()));
   }
 
   rot13(var ch) {
     var c = ch.codeUnitAt(0);
-    if (c >= 'a'.codeUnitAt(0) && c <= 'm'.codeUnitAt(0)) c += 13;
-    else if (c >= 'A'.codeUnitAt(0) && c <= 'M'.codeUnitAt(0)) c += 13;
-    else if (c >= 'n'.codeUnitAt(0) && c <= 'z'.codeUnitAt(0)) c -= 13;
-    else if (c >= 'N'.codeUnitAt(0) && c <= 'Z'.codeUnitAt(0)) c -= 13;
+    if (c >= 'a'.codeUnitAt(0) && c <= 'm'.codeUnitAt(0)) {
+      c += 13;
+    } else if (c >= 'A'.codeUnitAt(0) && c <= 'M'.codeUnitAt(0)) {
+      c += 13;
+    } else if (c >= 'n'.codeUnitAt(0) && c <= 'z'.codeUnitAt(0)) {
+      c -= 13;
+    } else if (c >= 'N'.codeUnitAt(0) && c <= 'Z'.codeUnitAt(0)) {
+      c -= 13;
+    }
     return new String.fromCharCode(c);
   }
 }