Update TodoMVC based on https://github.com/polymer/todomvc

samples/third_party/todomvc/web/editable_label.html

Index: samples/third_party/todomvc/web/editable_label.html
diff --git a/samples/third_party/todomvc/web/editable_label.html b/samples/third_party/todomvc/web/editable_label.html
deleted file mode 100644
index f42b271cc0389e22e2d6220b69f64a5e8fa6aa6d..0000000000000000000000000000000000000000
--- a/samples/third_party/todomvc/web/editable_label.html
+++ /dev/null
@@ -1,19 +0,0 @@
-<!--
-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.
--->
-<polymer-element name="editable-label">
-  <template>
-    <template if="{{!editing}}">
-      <label class='edit-label' on-doubleclick="{{edit}}">{{value}}</label>
-    </template>
-    <template if="{{editing}}">
-      <form on-submit="{{update}}">
-        <input id="edit" class="edit editing"
-               on-blur="{{update}}" on-keyup="{{maybeCancel}}">
-      </form>
-    </template>
-  </template>
-  <script type="application/dart" src="editable_label.dart"></script>
-</polymer-element>