Remove uses of dart:io Options in dart2js and dartdoc.

sdk/lib/_internal/dartdoc/bin/dartdoc.dart

Index: sdk/lib/_internal/dartdoc/bin/dartdoc.dart
diff --git a/sdk/lib/_internal/dartdoc/bin/dartdoc.dart b/sdk/lib/_internal/dartdoc/bin/dartdoc.dart
index 72c5c327b3d45956beacd410e5ceeab8fab445e9..a5e6324eb5ab4759a0817e3588e1aa2948e755f0 100644
--- a/sdk/lib/_internal/dartdoc/bin/dartdoc.dart
+++ b/sdk/lib/_internal/dartdoc/bin/dartdoc.dart
@@ -27,20 +27,10 @@ import 'package:path/path.dart' as path;
 /**
  * Run this from the `lib/_internal/dartdoc` directory.
  */
-main() {
-  mainWithOptions(new Options());
-}
-
-/**
- * We use this to include dartdoc in a single snapshot with dart2js.
- * (They share 90% of the code)
- */
-mainWithOptions(Options options) {
+main(List<String> args) {
   // Need this because ArgParser.getUsage doesn't show command invocation.
   final USAGE = 'Usage dartdoc [options] <entrypoint(s)>\n[options] include:';
 
-  final args = options.arguments;
-
   final dartdoc = new Dartdoc();
 
   final argParser = new ArgParser();