Revert "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_generated/lib/src/barback/excluding_aggregate_transformer.dart b/sdk/lib/_internal/pub_generated/lib/src/barback/excluding_aggregate_transformer.dart
deleted file mode 100644
index a45f824bf89de0331282c03ef0c4020b701ca522..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/lib/src/barback/excluding_aggregate_transformer.dart
+++ /dev/null
@@ -1,69 +0,0 @@
-// 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.
-
-library pub.excluding_aggregate_transformer;
-
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-
-import 'transformer_config.dart';
-
-/// Decorates an inner [AggregateTransformer] and handles including and
-/// excluding primary inputs.
-class ExcludingAggregateTransformer extends AggregateTransformer {
-  /// If [config] defines includes or excludes, wraps [inner] in an
-  /// [ExcludingAggregateTransformer] that handles those.
-  ///
-  /// Otherwise, just returns [inner] unmodified.
-  static AggregateTransformer wrap(AggregateTransformer inner,
-      TransformerConfig config) {
-    if (!config.hasExclusions) return inner;
-
-    if (inner is LazyAggregateTransformer) {
-      return new _LazyExcludingAggregateTransformer(
-          inner as LazyAggregateTransformer,
-          config);
-    } else if (inner is DeclaringAggregateTransformer) {
-      return new _DeclaringExcludingAggregateTransformer(
-          inner as DeclaringAggregateTransformer,
-          config);
-    } else {
-      return new ExcludingAggregateTransformer._(inner, config);
-    }
-  }
-
-  final AggregateTransformer _inner;
-
-  /// The config containing rules for which assets to include or exclude.
-  final TransformerConfig _config;
-
-  ExcludingAggregateTransformer._(this._inner, this._config);
-
-  classifyPrimary(AssetId id) {
-    if (!_config.canTransform(id.path)) return null;
-    return _inner.classifyPrimary(id);
-  }
-
-  Future apply(AggregateTransform transform) => _inner.apply(transform);
-
-  String toString() => _inner.toString();
-}
-
-class _DeclaringExcludingAggregateTransformer extends
-    ExcludingAggregateTransformer implements DeclaringAggregateTransformer {
-  _DeclaringExcludingAggregateTransformer(DeclaringAggregateTransformer inner,
-      TransformerConfig config)
-      : super._(inner as AggregateTransformer, config);
-
-  Future declareOutputs(DeclaringAggregateTransform transform) =>
-      (_inner as DeclaringAggregateTransformer).declareOutputs(transform);
-}
-
-class _LazyExcludingAggregateTransformer extends
-    _DeclaringExcludingAggregateTransformer implements LazyAggregateTransformer {
-  _LazyExcludingAggregateTransformer(DeclaringAggregateTransformer inner,
-      TransformerConfig config)
-      : super(inner, config);
-}