Updating the samples page to reflect the examples that have been retired.

src/site/samples/google_maps/example/index.dart

-// Copyright (c) 2013, 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.
-
-library google_maps;
-
-// This code is derived from
-// https://developers.google.com/maps/documentation/javascript/tutorial#HelloWorld
-// You can view the original JavaScript example at
-// https://developers.google.com/maps/documentation/javascript/examples/map-simple
-
-import 'dart:html' show querySelector;
-import 'dart:js' show context, JsObject;
-
-void main() {
-  // The top-level getter context provides a JsObject that represents the global
-  // object in JavaScript.
-  final google_maps = context['google']['maps'];
-
-  // new JsObject() constructs a new JavaScript object and returns a proxy
-  // to it.
-  var center = new JsObject(google_maps['LatLng'], [-34.397, 150.644]);
-
-  var mapTypeId = google_maps['MapTypeId']['ROADMAP'];
-
-  // new JsObject.jsify() recursively converts a collection of Dart objects
-  // to a collection of JavaScript objects and returns a proxy to it.
-  var mapOptions = new JsObject.jsify({
-      "center": center,
-      "zoom": 8,
-      "mapTypeId": mapTypeId
-  });
-
-  // Nodes are passed though, or transferred, not proxied.
-  new JsObject(google_maps['Map'], [querySelector('#map-canvas'), mapOptions]);
-}