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

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

Index: mojo/public/dart/third_party/barback/test/transformer/create_asset.dart
diff --git a/mojo/public/dart/third_party/barback/test/transformer/create_asset.dart b/mojo/public/dart/third_party/barback/test/transformer/create_asset.dart
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index 0000000000000000000000000000000000000000..82e80b37d4ba8a3e681ae5066126aa5482800c6d
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+++ b/mojo/public/dart/third_party/barback/test/transformer/create_asset.dart
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+// Copyright (c) 2013, 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.create_asset;
+
+import 'package:barback/barback.dart';
+
+import 'mock.dart';
+
+/// A transformer that outputs an asset with the given id.
+class CreateAssetTransformer extends MockTransformer {
+  final String output;
+
+  CreateAssetTransformer(this.output);
+
+  bool doIsPrimary(AssetId id) => true;
+
+  void doApply(Transform transform) {
+    transform.addOutput(
+        new Asset.fromString(new AssetId.parse(output), output));
+  }
+}