Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/lib/src/barback/excluding_aggregate_transformer.dart

Index: sdk/lib/_internal/pub_generated/lib/src/barback/excluding_aggregate_transformer.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/excluding_aggregate_transformer.dart b/sdk/lib/_internal/pub_generated/lib/src/barback/excluding_aggregate_transformer.dart
similarity index 81%
copy from sdk/lib/_internal/pub/lib/src/barback/excluding_aggregate_transformer.dart
copy to sdk/lib/_internal/pub_generated/lib/src/barback/excluding_aggregate_transformer.dart
index beed5ce776ce49873404297676f117ac55a641bd..a45f824bf89de0331282c03ef0c4020b701ca522 100644
--- a/sdk/lib/_internal/pub/lib/src/barback/excluding_aggregate_transformer.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/barback/excluding_aggregate_transformer.dart
@@ -23,10 +23,12 @@ class ExcludingAggregateTransformer extends AggregateTransformer {
 
     if (inner is LazyAggregateTransformer) {
       return new _LazyExcludingAggregateTransformer(
-          inner as LazyAggregateTransformer, config);
+          inner as LazyAggregateTransformer,
+          config);
     } else if (inner is DeclaringAggregateTransformer) {
       return new _DeclaringExcludingAggregateTransformer(
-          inner as DeclaringAggregateTransformer, config);
+          inner as DeclaringAggregateTransformer,
+          config);
     } else {
       return new ExcludingAggregateTransformer._(inner, config);
     }
@@ -49,21 +51,19 @@ class ExcludingAggregateTransformer extends AggregateTransformer {
   String toString() => _inner.toString();
 }
 
-class _DeclaringExcludingAggregateTransformer
-    extends ExcludingAggregateTransformer
-    implements DeclaringAggregateTransformer {
+class _DeclaringExcludingAggregateTransformer extends
+    ExcludingAggregateTransformer implements DeclaringAggregateTransformer {
   _DeclaringExcludingAggregateTransformer(DeclaringAggregateTransformer inner,
-        TransformerConfig config)
+      TransformerConfig config)
       : super._(inner as AggregateTransformer, config);
 
   Future declareOutputs(DeclaringAggregateTransform transform) =>
       (_inner as DeclaringAggregateTransformer).declareOutputs(transform);
 }
 
-class _LazyExcludingAggregateTransformer
-    extends _DeclaringExcludingAggregateTransformer
-    implements LazyAggregateTransformer {
+class _LazyExcludingAggregateTransformer extends
+    _DeclaringExcludingAggregateTransformer implements LazyAggregateTransformer {
   _LazyExcludingAggregateTransformer(DeclaringAggregateTransformer inner,
-        TransformerConfig config)
+      TransformerConfig config)
       : super(inner, config);
 }