Update pub to use the new command runner API in args.

sdk/lib/_internal/pub/lib/src/command/cache_repair.dart

Index: sdk/lib/_internal/pub/lib/src/command/cache_repair.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command/cache_repair.dart b/sdk/lib/_internal/pub/lib/src/command/cache_repair.dart
index d5b3212c9ffcb6b467a805b229363ec77be0a599..3e130e96904d6fa468a57b15a94a7f4011335d51 100644
--- a/sdk/lib/_internal/pub/lib/src/command/cache_repair.dart
+++ b/sdk/lib/_internal/pub/lib/src/command/cache_repair.dart
@@ -15,11 +15,13 @@ import '../utils.dart';
 
 /// Handles the `cache repair` pub command.
 class CacheRepairCommand extends PubCommand {
+  String get name => "repair";
   String get description => "Reinstall cached packages.";
-  String get usage => "pub cache repair";
+  String get invocation => "pub cache repair";
   String get docUrl => "http://dartlang.org/tools/pub/cmd/pub-cache.html";
+  bool get takesArguments => false;
 
-  Future onRun() async {
+  Future run() async {
     var successes = 0;
     var failures = 0;