Remove barback from the repo.

pkg/barback/lib/src/transformer/wrapping_aggregate_transformer.dart

Index: pkg/barback/lib/src/transformer/wrapping_aggregate_transformer.dart
diff --git a/pkg/barback/lib/src/transformer/wrapping_aggregate_transformer.dart b/pkg/barback/lib/src/transformer/wrapping_aggregate_transformer.dart
deleted file mode 100644
index f41d07584a3fdcd742e6bfcd89c52081ad02518d..0000000000000000000000000000000000000000
--- a/pkg/barback/lib/src/transformer/wrapping_aggregate_transformer.dart
+++ /dev/null
@@ -1,84 +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 barback.transformer.wrapping_aggregate_transformer;
-
-import 'dart:async';
-
-import '../asset/asset_id.dart';
-import '../utils.dart';
-import 'aggregate_transform.dart';
-import 'aggregate_transformer.dart';
-import 'declaring_aggregate_transform.dart';
-import 'declaring_aggregate_transformer.dart';
-import 'declaring_transform.dart';
-import 'declaring_transformer.dart';
-import 'lazy_aggregate_transformer.dart';
-import 'lazy_transformer.dart';
-import 'transform.dart';
-import 'transformer.dart';
-
-/// An [AggregateTransformer] that wraps a non-aggregate [Transformer].
-///
-/// Although barback internally works in terms of [AggregateTransformer]s, most
-/// transformers only work on individual primary inputs in isolation. We want to
-/// allow those transformers to implement the more user-friendly [Transformer]
-/// interface. This class makes that possible.
-class WrappingAggregateTransformer implements AggregateTransformer {
-  /// The wrapped transformer.
-  final Transformer transformer;
-
-  factory WrappingAggregateTransformer(Transformer transformer) {
-    if (transformer is LazyTransformer) {
-      return new _LazyWrappingAggregateTransformer(
-          transformer as LazyTransformer);
-    } else if (transformer is DeclaringTransformer) {
-      return new _DeclaringWrappingAggregateTransformer(
-          transformer as DeclaringTransformer);
-    } else {
-      return new WrappingAggregateTransformer._(transformer);
-    }
-  }
-
-  WrappingAggregateTransformer._(this.transformer);
-
-  Future<String> classifyPrimary(AssetId id) {
-    return syncFuture(() => transformer.isPrimary(id))
-        .then((isPrimary) => isPrimary ? id.path : null);
-  }
-
-  Future apply(AggregateTransform aggregateTransform) {
-    return newTransform(aggregateTransform)
-        .then((transform) => transformer.apply(transform));
-  }
-
-  String toString() => transformer.toString();
-}
-
-/// A wrapper for [DeclaringTransformer]s that implements
-/// [DeclaringAggregateTransformer].
-class _DeclaringWrappingAggregateTransformer
-    extends WrappingAggregateTransformer
-    implements DeclaringAggregateTransformer {
-  final DeclaringTransformer _declaring;
-
-  _DeclaringWrappingAggregateTransformer(DeclaringTransformer transformer)
-      : _declaring = transformer,
-        super._(transformer as Transformer);
-
-  Future declareOutputs(DeclaringAggregateTransform aggregateTransform) {
-    return newDeclaringTransform(aggregateTransform).then((transform) {
-      return (transformer as DeclaringTransformer).declareOutputs(transform);
-    });
-  }
-}
-
-/// A wrapper for [LazyTransformer]s that implements
-/// [LazyAggregateTransformer].
-class _LazyWrappingAggregateTransformer
-    extends _DeclaringWrappingAggregateTransformer
-    implements LazyAggregateTransformer {
-  _LazyWrappingAggregateTransformer(LazyTransformer transformer)
-      : super(transformer);
-}