MD Settings: change outlinks to actually use <a>

chrome/browser/resources/settings/a11y_page/manage_a11y_page.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="../controls/settings_slider.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="../settings_shared_css.html">
 <link rel="import" href="../settings_vars_css.html">
@@ skipping 189 matching lines @@
 
     <h2>$i18n{audioHeading}</h2>
     <div class="settings-box block first">
       <settings-toggle-button
           pref="{{prefs.settings.a11y.mono_audio}}"
           label="$i18n{monoAudioLabel}">
       </settings-toggle-button>
     </div>
 
     <template is="dom-if" if="[[!isGuest_]]">
-      <div class="settings-box two-line" on-tap="onMoreFeaturesTap_" actionable>
+      <a class="settings-box two-line" actionable tabindex="-1" target="_blank"
+          href="https://chrome.google.com/webstore/category/collection/accessibility">
         <div class="start">
           $i18n{additionalFeaturesTitle}
           <div class="secondary" id="moreFeaturesSecondary">
             $i18n{a11yWebStore}
           </div>
         </div>
         <button class="icon-external" is="paper-icon-button-light"
             aria-label="$i18n{additionalFeaturesTitle}"
             aria-describedby="moreFeaturesSecondary"></button>
-      </div>
+      </a>
     </template>
   </template>
   <script src="manage_a11y_page.js"></script>
 </dom-module>