MD Settings: fix attribute name typo to enhance a11y of JavaScript subpage button on content settin…

chrome/browser/resources/settings/site_settings_page/site_settings_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="../icons.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="../settings_shared_css.html">
 <link rel="import" href="../site_settings/constants.html">
 <link rel="import" href="../site_settings/site_settings_behavior.html">
 <link rel="import" href="../site_settings/site_settings_prefs_browser_proxy.html">
 
@@ skipping 103 matching lines @@
           aria-label="$i18n{siteSettingsNotifications}"
           aria-describedby="notificationsSecondary"></button>
     </div>
     <div class="settings-box two-line"
         category$="[[ContentSettingsTypes.JAVASCRIPT]]"
         data-route="SITE_SETTINGS_JAVASCRIPT" on-tap="onTapNavigate_"
         actionable>
       <iron-icon icon="settings:input"></iron-icon>
       <div class="middle">
         $i18n{siteSettingsJavascript}
-        <div class="secondary" is="javascriptSecondary">
+        <div class="secondary" id="javascriptSecondary">
           [[defaultSettingLabel_(
               default_.javascript,
               '$i18nPolymer{siteSettingsAllowed}',
               '$i18nPolymer{siteSettingsBlocked}')]]
         </div>
       </div>
       <button class="subpage-arrow" is="paper-icon-button-light"
           aria-label="$i18n{siteSettingsJavascript}"
           aria-describedby="javascriptSecondary"></button>
     </div>
@@ skipping 166 matching lines @@
     <div class="settings-box" data-route="SITE_SETTINGS_PROTECTED_CONTENT"
         on-tap="onTapNavigate_" actionable>
       <iron-icon icon="settings:security"></iron-icon>
       <div class="middle">$i18n{siteSettingsProtectedContent}</div>
       <button class="subpage-arrow" is="paper-icon-button-light"
           aria-label="$i18n{siteSettingsProtectedContent}"></button>
     </div>
   </template>
   <script src="site_settings_page.js"></script>
 </dom-module>