Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/barback/test/transformer/lazy_aggregate_many_to_one.dart

Index: mojo/public/dart/third_party/barback/test/transformer/lazy_aggregate_many_to_one.dart
diff --git a/mojo/public/dart/third_party/barback/test/transformer/lazy_aggregate_many_to_one.dart b/mojo/public/dart/third_party/barback/test/transformer/lazy_aggregate_many_to_one.dart
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+// 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.test.transformer.lazy_aggregate_many_to_one;
+
+import 'package:barback/barback.dart';
+
+import 'declaring_aggregate_many_to_one.dart';
+
+/// Like [AggregateManyToOneTransformer], but returns a lazy asset that doesn't
+/// perform the rewrite until it's materialized.
+class LazyAggregateManyToOneTransformer
+    extends DeclaringAggregateManyToOneTransformer
+    implements LazyAggregateTransformer {
+  LazyAggregateManyToOneTransformer(String extension, String output)
+      : super(extension, output);
+}