[MD settings] cleanup   use

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

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <if expr="chromeos">
 <link rel="import" href="chrome://md-settings/controls/settings_checkbox.html">
 </if>
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 
 <dom-module id="settings-a11y-page">
   <template>
     <style include="settings-shared"></style>
 <if expr="chromeos">
     <div class="settings-box row first">
-      $i18n{a11yExplanation}&nbsp;
-      <a href="$i18nRaw{a11yLearnMoreUrl}"
-          target="_blank">$i18n{learnMore}</a>
+      <span>
+        $i18n{a11yExplanation}
+        <a href="$i18nRaw{a11yLearnMoreUrl}" target="_blank">
+          $i18n{learnMore}
+        </a>
+      </span>
     </div>
 
     <div class="settings-box block">
       <settings-checkbox label="$i18n{optionsInMenuLabel}"
           pref="{{prefs.settings.a11y.enable_menu}}">
       </settings-checkbox>
       <settings-checkbox label="$i18n{largeMouseCursorLabel}"
           pref="{{prefs.settings.a11y.large_cursor_enabled}}">
       </settings-checkbox>
       <settings-checkbox label="$i18n{highContrastLabel}"
@@ skipping 60 matching lines @@
     <div class="settings-box first">
 </if>
       <div class="button-strip">
         <paper-button class="primary-button"
             on-tap="onMoreFeaturesTap_">$i18n{moreFeaturesLink}</paper-button>
       </div>
     </div>
   </template>
   <script src="a11y_page.js"></script>
 </dom-module>