[MD settings] updating polymer to 1.1.13

chrome/browser/resources/settings/on_startup_page/on_startup_page.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-button/paper-radio-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-group/paper-radio-group.html">
 <link rel="import" href="chrome://md-settings/on_startup_page/startup_urls_page.html">
 
 <dom-module id="cr-settings-on-startup-page">
   <link rel="import" type="css"
       href="chrome://md-settings/settings_page/settings_page.css">
   <link rel="import" type="css" href="on_startup_shared.css">
   <template>
     <cr-settings-animated-pages id="pages" in-subpage="{{inSubpage}}">
       <neon-animatable id="main">
         <div id="locationLabel" i18n-content="onStartup"></div>
         <div>
           <paper-radio-group selected="{{prefValue}}">
-            <!--
-            see https://github.com/PolymerElements/paper-radio-button/issues/51
-            for info on 'placeholder' -->
             <paper-radio-button
-                name="5" i18n-content="onStartupOpenNewTab">placeholder
+                name="5" i18n-content="onStartupOpenNewTab">
             </paper-radio-button>
             <paper-radio-button
-                name="1" i18n-content="onStartupContinue">placeholder
+                name="1" i18n-content="onStartupContinue">
             </paper-radio-button>
             <paper-radio-button
-                name="4" i18n-content="onStartupOpenSpecific">placeholder
+                name="4" i18n-content="onStartupOpenSpecific">
             </paper-radio-button>
           </paper-radio-group>
           <paper-button
               on-tap="onSetPagesTap_" raised i18n-content="onStartupSetPages">
           </paper-button>
         </div>
       </neon-animatable>
       <neon-animatable id="startup-urls">
         <div class="subheader">
           <paper-icon-button icon="arrow-back" on-tap="onBackTap_">
           </paper-icon-button>
           <h2 i18n-content="onStartupSetPages"></h2>
         </div>
         <cr-settings-startup-urls-page prefs="{{prefs}}">
         </cr-settings-startup-urls-page>
       </neon-animatable>
     </cr-settings-animated-pages>
   </template>
   <script src="on_startup_page.js"></script>
 </dom-module>