A variety of cleanups to bring our samples up-to-date.

samples/webcomponents/contactifier/contactifier.dart

-// Copyright (c) 2011, 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.
-
-/** A contacts app. */
-#library('contactifier');
-
-#import('dart:html');
-
-#source('ContactsWidget.dart');
-
-const String SITE_NAME = 'Contactifier Inc.';
-
-void main() {
-  // TODO(samhop): check for shadow dom support
-  var contacts = new ContactsWidget(query('#contactsWidget'));
-  queryAll('.siteName').forEach((e) {
-    e.nodes.add(new Element.html('<p class="siteName">$SITE_NAME</p>'));
-  });
-}