[MD settings] adding dom-if to hide homepage settings

chrome/browser/resources/settings/appearance_page/appearance_page.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://md-settings/checkbox/checkbox.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.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">
 
 <dom-module id="cr-settings-appearance-page">
   <link rel="import" type="css"
       href="chrome://md-settings/settings_page/settings_page.css">
   <link rel="import" type="css"
       href="chrome://md-settings/appearance_page/appearance_page.css">
   <link rel="import" type="css" href="chrome://resources/css/widgets.css">
   <link rel="import" href="chrome://resources/html/action_link.html">
   <template>
     <div id="action-container">
       <paper-button i18n-content="setWallpaper"></paper-button>
       <paper-button id="get-themes" i18n-content="getThemes"
           on-tap="openThemesGallery_">
       </paper-button>
       <paper-button id="resetTheme" i18n-content="resetToDefaultTheme" disabled
           on-tap="resetTheme_">
       </paper-button>
     </div>
     <hr>
     <cr-settings-checkbox pref="{{prefs.browser.show_home_button}}"
         i18n-values="label:showHomeButton">
     </cr-settings-checkbox>
-    <div class="radio-container">
-      <paper-radio-group
-          hidden="[[!prefs.browser.show_home_button.value]]"
-          selected="{{isNewTabPageString_}}">
-        <paper-radio-button name="t" i18n-content="homePageNtp">
-        </paper-radio-button>
-        <paper-radio-button name="f" i18n-content="openThisPage">
-        </paper-radio-button>
-      </paper-radio-group>
-    </div>
+    <template is="dom-if" if="{{prefs.browser.show_home_button.value}}">
+      <div class="radio-container">
+        <paper-radio-group
+            selected="{{isNewTabPageString_}}">
+          <paper-radio-button name="t">[[i18n_.homePageNtp]]</paper-radio-button>

[Dan Beam, 2015/09/16 22:08:35]

<paper-radio-button
    name="t">[[i18n_.homePageNtp]]</paper-radio-button>

seems like it'd also work

+          <paper-radio-button name="f">[[i18n_.openThisPage]]</paper-radio-button>
+        </paper-radio-group>
+      </div>
+    </template>
     <cr-settings-checkbox pref="{{prefs.bookmark_bar.show_on_all_tabs}}"
         i18n-values="label:showBookmarksBar">
     </cr-settings-checkbox>
   </template>
   <script src="appearance_page.js"></script>
 </dom-module>