Roll to pickup pool changes

packages/barback/lib/src/transformer/barback_settings.dart

 // Copyright (c) 2013, 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 barback.transformer.barback_settings;
 
 /// A generic settings object for providing configuration details to
 /// [Transformer]s.
 ///
 /// Barback does not specify *how* this is provided to transformers. It is up
@@ skipping 30 matching lines @@
 
   /// The name of the mode.
   ///
   /// By convention, this is a lowercase string.
   final String name;
 
   /// Create a mode named [name].
   factory BarbackMode(String name) {
     // Use canonical instances of known names.
     switch (name) {
-      case "debug": return BarbackMode.DEBUG;
-      case "release": return BarbackMode.RELEASE;
+      case "debug":
+        return BarbackMode.DEBUG;
+      case "release":
+        return BarbackMode.RELEASE;
       default:
         return new BarbackMode._(name);
     }
   }
 
   const BarbackMode._(this.name);
 
   String toString() => name;
 }