Update skyx after material design update d86123d4c71d28

sky/tools/skyx/bin/skyx.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:io';
 import 'dart:async';
 
 import 'package:archive/archive.dart';
 import 'package:args/args.dart';
 import 'package:yaml/yaml.dart';
 
 const String kSnapshotKey = 'snapshot_blob.bin';
 const List<String> kDensities = const ['drawable-xxhdpi'];
-const List<String> kThemes = const ['white', 'black', 'grey600'];
+const List<String> kThemes = const ['white', 'black'];
 const List<int> kSizes = const [24];
 
 class Asset {
   final String base;
   final String key;
 
   Asset({ this.base, this.key });
 }
 
 Iterable<Asset> parseAssets(Map manifestDescriptor, String manifestPath) sync* {
@@ skipping 100 matching lines @@
 
   for (Asset asset in assets)
     archive.addFile(await createFile(asset.key, asset.base));
 
   for (MaterialAsset asset in materialAssets)
     archive.addFile(await createFile(asset.key, args['asset-base']));
 
   File outputFile = new File(args['output-file']);
   await outputFile.writeAsBytes(new ZipEncoder().encode(archive));
 }