Use native async/await support in pub.

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

Index: sdk/lib/_internal/pub_generated/lib/src/command/version.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/command/version.dart b/sdk/lib/_internal/pub_generated/lib/src/command/version.dart
deleted file mode 100644
index de40572a3a430a86ad405073573ebbd48af5a253..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/lib/src/command/version.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright (c) 2012, 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.version;
-
-import '../command.dart';
-import '../log.dart' as log;
-import '../sdk.dart' as sdk;
-
-/// Handles the `version` pub command.
-class VersionCommand extends PubCommand {
-  String get name => "version";
-  String get description => "Print pub version.";
-  String get invocation => "pub version";
-
-  void run() {
-    log.message("Pub ${sdk.version}");
-  }
-}