[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/iron-flex-layout/classes/iron-shadow-flex-layout.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 <style>
@@ skipping 266 matching lines @@
 
   html /deep/ .fixed-top {
     top: 0;
     left: 0;
     right: 0;
   }
 
   html /deep/ .fixed-right {
     top: 0;
     right: 0;
-    botttom: 0;
+    bottom: 0;
   }
 
   html /deep/ .fixed-bottom {
     right: 0;
     bottom: 0;
     left: 0;
   }
 
   html /deep/ .fixed-left {
     top: 0;
-    botttom: 0;
+    bottom: 0;
     left: 0;
   }
 
 </style>