Remove uses of Options from pkg, samples, tests, and third_party directories.

pkg/watcher/example/watch.dart

Index: pkg/watcher/example/watch.dart
diff --git a/pkg/watcher/example/watch.dart b/pkg/watcher/example/watch.dart
index 235578dd673678f30393c5f78217ab47c0684256..aba127d6dd452a44de73b06f66571728c046aa36 100644
--- a/pkg/watcher/example/watch.dart
+++ b/pkg/watcher/example/watch.dart
@@ -10,15 +10,14 @@ import 'dart:io';
 import 'package:path/path.dart' as p;
 import 'package:watcher/watcher.dart';
 
-main() {
-  var args = new Options().arguments;
-  if (args.length != 1) {
+main(List<String> arguments) {
+  if (arguments.length != 1) {
     print("Usage: watch <directory path>");
     return;
   }
 
-  var watcher = new DirectoryWatcher(p.absolute(args[0]));
+  var watcher = new DirectoryWatcher(p.absolute(arguments[0]));
   watcher.events.listen((event) {
     print(event);
   });
-}
+}