Roll to pickup pool changes

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

Index: packages/barback/example/aggregate_transformer/lib/transformer.dart
diff --git a/packages/barback/example/aggregate_transformer/lib/transformer.dart b/packages/barback/example/aggregate_transformer/lib/transformer.dart
index 35634dc9120cc522d4b87088ffded39e53b79bb2..f96701c26ba207f1b34f003012a826f80aa467b3 100644
--- a/packages/barback/example/aggregate_transformer/lib/transformer.dart
+++ b/packages/barback/example/aggregate_transformer/lib/transformer.dart
@@ -16,7 +16,6 @@ class MakeBook extends AggregateTransformer {
   // to handle. Return a value for the assets you want to handle,
   // or null for those that you do not want to handle.
   classifyPrimary(AssetId id) {
-
     // Only process assets where the filename ends with "recipe.html".
     if (!id.path.endsWith('recipe.html')) return null;