Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components/paper-radio-group/paper-radio-group.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
 -->
 
 <link rel="import" href="../polymer/polymer.html">
 <link rel="import" href="../iron-selector/iron-selectable.html">
 <link rel="import" href="../paper-radio-button/paper-radio-button.html">
 <link rel="import" href="../iron-a11y-keys-behavior/iron-a11y-keys-behavior.html">
 
 <!--
 `paper-radio-group` allows user to select only one radio button from a set.
 Checking one radio button that belongs to a radio group unchecks any
 previously checked radio button within the same group. Use
 `selected` to get or set the selected radio button.
 
 Example:
 
     <paper-radio-group selected="small">
-      <paper-radio-button name="small" label="Small"></paper-radio-button>
-      <paper-radio-button name="medium" label="Medium"></paper-radio-button>
-      <paper-radio-button name="large" label="Large"></paper-radio-button>
+      <paper-radio-button name="small">Small</paper-radio-button>
+      <paper-radio-button name="medium">Medium</paper-radio-button>
+      <paper-radio-button name="large">Large</paper-radio-button>
     </paper-radio-group>
 
 See <a href="paper-radio-button.html">paper-radio-button</a> for more
 information about `paper-radio-button`.
 
 @group Paper Elements
 @element paper-radio-group
 @hero hero.svg
 @demo demo/index.html
 -->
@@ skipping 97 matching lines @@
       var newIndex = Number(this._valueToIndex(this.selected));
 
       do {
         newIndex = (newIndex + 1 + length) % length;
       } while (this.items[newIndex].disabled)
 
       this.select(this._indexToValue(newIndex));
     },
   });
 </script>