Remove the Dromaeo and TodoMVC samples.

samples/third_party/todomvc_performance/web/lib-elements/simple_router.dart

-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-library todomvc.web.lib_elements.simple_router;
-
-import 'dart:async';
-import 'dart:html';
-import 'package:polymer/polymer.dart';
-
-// A very simple router for TodoMVC. Real app should use package:route, but it
-// does not currently support Shadow DOM.
-@CustomTag('simple-router')
-class SimpleRouter extends PolymerElement {
-  @published String route = '';
-
-  StreamSubscription _sub;
-
-  factory SimpleRouter() => new Element.tag('simple-router');
-  SimpleRouter.created() : super.created();
-
-  attached() {
-    super.attached();
-    _sub = windowLocation.changes.listen((_) {
-      var hash = window.location.hash;
-      if (hash.startsWith('#/')) hash = hash.substring(2);
-      // TODO(jmesserly): empty string is not triggering a call to TodoList
-      // routeChanged after deployment. Use 'all' as a workaround.
-      if (hash == '') hash = 'all';
-      route = hash;
-    });
-  }
-
-  detached() {
-    super.detached();
-    _sub.cancel();
-  }
-
-  routeChanged() {
-    fire('route', detail: route);
-  }
-}