Revert "Revert "Use native async/await support in pub.""

sdk/lib/_internal/pub_generated/lib/src/command/cache.dart

Index: sdk/lib/_internal/pub_generated/lib/src/command/cache.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/command/cache.dart b/sdk/lib/_internal/pub_generated/lib/src/command/cache.dart
deleted file mode 100644
index 432f09655357897b2a3afe7afe451737a2279a36..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/lib/src/command/cache.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-// 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 pub.command.cache;
-
-import '../command.dart';
-import 'cache_add.dart';
-import 'cache_list.dart';
-import 'cache_repair.dart';
-
-/// Handles the `cache` pub command.
-class CacheCommand extends PubCommand {
-  String get name => "cache";
-  String get description => "Work with the system cache.";
-  String get invocation => "pub cache <subcommand>";
-  String get docUrl => "http://dartlang.org/tools/pub/cmd/pub-cache.html";
-
-  CacheCommand() {
-    addSubcommand(new CacheAddCommand());
-    addSubcommand(new CacheListCommand());
-    addSubcommand(new CacheRepairCommand());
-  }
-}