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

samples/third_party/todomvc/LICENSE

Index: samples/third_party/todomvc/LICENSE
diff --git a/samples/third_party/todomvc/LICENSE b/samples/third_party/todomvc/LICENSE
index 9e18462f57c87b07e4a3d03008f188708f8298e0..92d60b019fd2c88f8d353d14182ee72060dc3fa8 100644
--- a/samples/third_party/todomvc/LICENSE
+++ b/samples/third_party/todomvc/LICENSE
@@ -1,10 +1,27 @@
-LICENSE
--------
-
-All html and css in this directory is public domain, forked from
-https://github.com/addyosmani/todomvc/tree/master/template.
-
-All Dart code is subject to the following:
-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.
+// Copyright (c) 2012 The Polymer Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.